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Fun With Sony Cameras
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ggibson
Well-known member
Barry Haines
Active member
Barry Haines
Active member
A look back in time at early England - "And did those feet in ancient time...in Englands green & pleasant Land" by William Blake (Poem)
History of Silbury Hill... https://www.english-heritage.org.uk/visit/places/silbury-hill/history/
Silbury Hill is the largest artificial prehistoric mound in Europe. Probably built over a short period between about 2470 and 2350 BC, it is one of the most intriguing monuments in the prehistoric landscape of the Avebury World Heritage Site. We do not know its purpose, or its meaning for the late Neolithic people who built it, but its enduring presence in the landscape has inspired myths and legends as people have sought to explain its purpose.
History of Silbury Hill... https://www.english-heritage.org.uk/visit/places/silbury-hill/history/
Silbury Hill is the largest artificial prehistoric mound in Europe. Probably built over a short period between about 2470 and 2350 BC, it is one of the most intriguing monuments in the prehistoric landscape of the Avebury World Heritage Site. We do not know its purpose, or its meaning for the late Neolithic people who built it, but its enduring presence in the landscape has inspired myths and legends as people have sought to explain its purpose.
Barry Haines
Active member
A look back in time at early England - "And did those feet in ancient time...in Englands green & pleasant Land" by William Blake (Poem)
History of Wayland’s Smithy... https://www.english-heritage.org.uk/visit/places/waylands-smithy/history/
Wayland’s Smithy is a two-phase Neolithic tomb, built along the Ridgeway close to a north scarp of the Downs above the Vale of the White Horse in south Oxfordshire. The first monument here, built between 3590 and 3555 BC, was a mortuary structure of stone and wood.
The remains of 14 people – 11 men, two women and a child – were discovered in this first structure when it was excavated in 1963. Radiocarbon dating has shown that the first burials were probably placed there in 3590–3555 BC, and the last in 3580–3550 BC.
Footnotes:
This is one of my personal favourite places in all of England...This is a beautiful tranquil unassuming place to visit in South Oxfordshire along the Ridgeway Trail.
Wayland's Smithy is extremely old!...To put it into context it predates Stonehenge Circle by over 500 years and is over 800 years older than Egypt's first Pyramid.
The stepped Pyramid of Djoser circa 2667–2648 BC https://en.wikipedia.org/wiki/Pyramid_of_Djoser
Stonehenge Circle circa 3000BC https://www.english-heritage.org.uk/visit/places/stonehenge/history-and-stories/history/description/
OT - I will just add that I have spotted a Jellyfish Crop Circle nearby to Wayland's Smithy on Google Maps - https://www.google.co.uk/maps/place...39c9ab41c751a7f!8m2!3d51.5663197!4d-1.5953356
History of Wayland’s Smithy... https://www.english-heritage.org.uk/visit/places/waylands-smithy/history/
Wayland’s Smithy is a two-phase Neolithic tomb, built along the Ridgeway close to a north scarp of the Downs above the Vale of the White Horse in south Oxfordshire. The first monument here, built between 3590 and 3555 BC, was a mortuary structure of stone and wood.
The remains of 14 people – 11 men, two women and a child – were discovered in this first structure when it was excavated in 1963. Radiocarbon dating has shown that the first burials were probably placed there in 3590–3555 BC, and the last in 3580–3550 BC.
Footnotes:
This is one of my personal favourite places in all of England...This is a beautiful tranquil unassuming place to visit in South Oxfordshire along the Ridgeway Trail.
Wayland's Smithy is extremely old!...To put it into context it predates Stonehenge Circle by over 500 years and is over 800 years older than Egypt's first Pyramid.
The stepped Pyramid of Djoser circa 2667–2648 BC https://en.wikipedia.org/wiki/Pyramid_of_Djoser
Stonehenge Circle circa 3000BC https://www.english-heritage.org.uk/visit/places/stonehenge/history-and-stories/history/description/
OT - I will just add that I have spotted a Jellyfish Crop Circle nearby to Wayland's Smithy on Google Maps - https://www.google.co.uk/maps/place...39c9ab41c751a7f!8m2!3d51.5663197!4d-1.5953356
Last edited:
pegelli
Well-known member
Thanks for the history background with the images Barry, much appreciated and value added to the wonderful images.
----------------------------------------
I took a bicycle ride into the Antwerp harbour area today. Here are two of the shots I came home with. Apparently diagonals worked for me today:
disused grain silo
tanker detail
both A7ii + OM Zuiko 135/2.8
----------------------------------------
I took a bicycle ride into the Antwerp harbour area today. Here are two of the shots I came home with. Apparently diagonals worked for me today:
disused grain silo
tanker detail
both A7ii + OM Zuiko 135/2.8
Barry Haines
Active member
Thank you kindly Pieter 
I really didn't want to come over like I was trying to give everybody a boring English history lesson...So I shall make this my last ancient English site, despite having recently photographed several other places of interest.
It was more so to make people aware that England has a much wider and deeper wealth of history going back along way in time, even beyond Stonehenge which is what most people associate as being the oldest ancient site in England.
Norfolk for instance recorded the "Happisburgh Footprints" dating back over 800,000 years (Pleistocene - Ice age period) to the earliest Hominid footsteps outside of Africa https://en.wikipedia.org/wiki/Happisburgh_footprints
I was just dealing with the Neolithic period sites (up to 4,000 BC) in the Mid-South of England (Oxfordshire and Wiltshire) which are lovely places to visit if coming to England and excellent to photograph IMHO.
BTW Your OM 135mm F2.8 Zuiko turns out the goods in your more than capable hands ;-)
_____________________________
History of West Kennet Long Barrow... https://www.english-heritage.org.uk/visit/places/west-kennet-long-barrow/history/
One of the largest and most impressive Neolithic graves in Britain, West Kennet Long Barrow was built around 3650 BC and used for at least 1,000 years.
At just over 328 feet (100 metres), the barrow is second only to the nearby East Kennet Barrow in length. Although it is now covered with turf it would originally have had bare chalk sides and would have stood out against the landscape.
Some cremations and the partial remains of at least forty-six individuals – both male and female and of all ages – have been found inside, together with grave goods including pottery, beads and stone implements such as a dagger, dated to between 3000 and 2600 BC.
Footnotes:
West Kennet Long Barrow is probably best visited out of season, certainly if photography is your aim...As literally hundreds of us traipsed up the hill across the fields on this particular hot summers day ("Mad dogs and Englishmen").
You can enter and walk right inside the Barrow itself but it's pretty dark and hard to make anything out...but do be aware of the swallows flying in and out of the narrow entrance as they were nesting inside
Be prepared to wait to get your images, as so many people are walking in and out of your scene...It wasn't until I got home that I discovered I only had about 30% that were keepers.
West Kennet Long Barrow is a little bit older than "Wayland's Smithy" making it one of the very earliest Neolithic sites in all of ancient England...By comparison it is over a 1000 years older than the Great Pyramid of Giza (also known as Pyramid of Khufu / Pyramid of Cheops) which was constructed circa 2580–2560 BC https://en.wikipedia.org/wiki/Great_Pyramid_of_Giza
I really didn't want to come over like I was trying to give everybody a boring English history lesson...So I shall make this my last ancient English site, despite having recently photographed several other places of interest.
It was more so to make people aware that England has a much wider and deeper wealth of history going back along way in time, even beyond Stonehenge which is what most people associate as being the oldest ancient site in England.
Norfolk for instance recorded the "Happisburgh Footprints" dating back over 800,000 years (Pleistocene - Ice age period) to the earliest Hominid footsteps outside of Africa https://en.wikipedia.org/wiki/Happisburgh_footprints
I was just dealing with the Neolithic period sites (up to 4,000 BC) in the Mid-South of England (Oxfordshire and Wiltshire) which are lovely places to visit if coming to England and excellent to photograph IMHO.
BTW Your OM 135mm F2.8 Zuiko turns out the goods in your more than capable hands ;-)
_____________________________
History of West Kennet Long Barrow... https://www.english-heritage.org.uk/visit/places/west-kennet-long-barrow/history/
One of the largest and most impressive Neolithic graves in Britain, West Kennet Long Barrow was built around 3650 BC and used for at least 1,000 years.
At just over 328 feet (100 metres), the barrow is second only to the nearby East Kennet Barrow in length. Although it is now covered with turf it would originally have had bare chalk sides and would have stood out against the landscape.
Some cremations and the partial remains of at least forty-six individuals – both male and female and of all ages – have been found inside, together with grave goods including pottery, beads and stone implements such as a dagger, dated to between 3000 and 2600 BC.
Footnotes:
West Kennet Long Barrow is probably best visited out of season, certainly if photography is your aim...As literally hundreds of us traipsed up the hill across the fields on this particular hot summers day ("Mad dogs and Englishmen").
You can enter and walk right inside the Barrow itself but it's pretty dark and hard to make anything out...but do be aware of the swallows flying in and out of the narrow entrance as they were nesting inside
Be prepared to wait to get your images, as so many people are walking in and out of your scene...It wasn't until I got home that I discovered I only had about 30% that were keepers.
West Kennet Long Barrow is a little bit older than "Wayland's Smithy" making it one of the very earliest Neolithic sites in all of ancient England...By comparison it is over a 1000 years older than the Great Pyramid of Giza (also known as Pyramid of Khufu / Pyramid of Cheops) which was constructed circa 2580–2560 BC https://en.wikipedia.org/wiki/Great_Pyramid_of_Giza
Last edited:
ggibson
Well-known member
Some recent shots with the Sony 55/1.8:
Santa Cruz Flowers by Graham Gibson, on Flickr
Santa Cruz Flowers by Graham Gibson, on Flickr
Santa Cruz by Graham Gibson, on Flickr
Santa Cruz Flowers by Graham Gibson, on Flickr
Santa Cruz Flowers by Graham Gibson, on Flickr
Santa Cruz by Graham Gibson, on Flickr
KeithDM
Well-known member
Decided it was more than high time I got out & about with my A7III, so this afternoon popped up the road to Avebury. Took the path along to Silbury Hill to take what I call 'long-lens landscapes', therefore had the 70-200 f4 G on the camera. The subject of the first photo below was not what I would normally use that lens for!
Flowering Teasel (Dipsacus)
Taking a Break
Flowering Teasel (Dipsacus)
Taking a Break
Barry Haines
Active member
With the recent A7R4 announcement with it's increased resolution...I thought it might be interesting to see what the "equivalent" focal length of a lens would be when in using the A7R4 cameras sensor crop mode setting.
The "True in camera crop size" (6240 x 4160) - https://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-7rm4/specifications
Obviously the actual focal length of a lens remains the same but cropping the sensor makes for a narrower AoV (Angle of View)....Hence "equivalent" focal length.
I know it's easier just to say 1.5 times is the focal length and be done with it...but I have tried to be a little more accurate than that...Plus it would be true to say that lens manufacturers are not always that precise in measuring or stipulating what the "True" focal length of a lens is.
Anyway this may be of help to some of you, helping you visualize quickly what choice of lenses to purchase in the future...You may or may not now require a Tele Converter (TC) ??? if you are planning on getting the A7R4 together with a Sony Tele Zoom that takes TC's.
Sony A7R4 Full Frame Sensor 35.7×23.8mm (3:2 Ratio)....FF 9504 x 6336 (60.217344MP's)...Cropped 6240 x 4160 (25.958400MP's)
9504 / 6240 = 1.523076923076923 Factor...6336 / 4160 = 1.523076923076923 Factor - The sensor has the same crop Factor in both directions (Horizontally and Verically) and is a precise 3:2 ratio
QUICK LOOK UP TABLE (Decimal points rounded up/down).
Prime Lenses
FF 10mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 15.2mm
FF 12mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 18.3mm
FF 15mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 22.8mm
FF 18mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 27.4mm
FF 20mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 30.5mm
FF 21mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 32.0mm
FF 24mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 36.6mm
FF 25mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 38.1mm
FF 28mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 42.6mm
FF 35mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 53.3mm
FF 40mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 60.9mm
FF 50mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 76.2mm
FF 55mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 83.8mm
FF 58mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 88.3mm
FF 60mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 91.4mm
FF 65mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 99.0mm
FF 70mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 106.6mm
FF 75mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 114.2mm
FF 90mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 137.1mm
FF 100mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 152.3mm
FF 110mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 167.5mm
FF 125mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 190.4mm
FF 135mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 205.6mm
FF 180mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 274.2mm
FF 200mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 304.6mm
FF 280mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 426.5mm
FF 300mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 456.9mm
FF 400mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 609.2mm
FF 500mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 761.5mm
FF 600mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 913.8mm
Sony Tele Zoom lenses GM 70-200mm, GM 100-400mm and G 200-600mm with and without 1.4x and 2.0x TC's
FF 70mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 106.6mm
FF 70mm Lens + 1.4x TC = 98mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 149.2mm
FF 70mm Lens + 2.0x TC = 140mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 213.2mm
FF 100mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 152.3mm
FF 100mm Lens + 1.4x TC = 140mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 213.2mm
FF 100mm Lens + 2.0x TC = 200mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 304.6mm
FF 200mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 304.6mm
FF 200mm Lens + 1.4x TC = 280mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 426.5mm
FF 200mm Lens + 2.0x TC = 400mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 609.2mm
FF 300mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 456.9mm
FF 300mm Lens + 1.4x TC = 420mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 639.7mm
FF 300mm Lens + 2.0x TC = 600mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 913.8mm
FF 400mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 609.2mm
FF 400mm Lens + 1.4x TC = 560mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 852.9mm
FF 400mm Lens + 2.0x TC = 800mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1218.5mm
FF 500mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 761.5mm
FF 500mm Lens + 1.4x TC = 700mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1066.2mm
FF 500mm Lens + 2.0x TC = 1000mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1523.1mm
FF 600mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 913.8mm
FF 600mm Lens + 1.4x TC = 840mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1279.4mm
FF 600mm Lens + 2.0x TC = 1200mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1827.7mm
It's more than possible that I have made a mistake here and there along the way...If you do happen to spot any errors, please feel free to let me know and I will edit/adjust the table accordingly - TIA
Cheers Barry
The "True in camera crop size" (6240 x 4160) - https://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-7rm4/specifications
Obviously the actual focal length of a lens remains the same but cropping the sensor makes for a narrower AoV (Angle of View)....Hence "equivalent" focal length.
I know it's easier just to say 1.5 times is the focal length and be done with it...but I have tried to be a little more accurate than that...Plus it would be true to say that lens manufacturers are not always that precise in measuring or stipulating what the "True" focal length of a lens is.
Anyway this may be of help to some of you, helping you visualize quickly what choice of lenses to purchase in the future...You may or may not now require a Tele Converter (TC) ??? if you are planning on getting the A7R4 together with a Sony Tele Zoom that takes TC's.
Sony A7R4 Full Frame Sensor 35.7×23.8mm (3:2 Ratio)....FF 9504 x 6336 (60.217344MP's)...Cropped 6240 x 4160 (25.958400MP's)
9504 / 6240 = 1.523076923076923 Factor...6336 / 4160 = 1.523076923076923 Factor - The sensor has the same crop Factor in both directions (Horizontally and Verically) and is a precise 3:2 ratio
QUICK LOOK UP TABLE (Decimal points rounded up/down).
Prime Lenses
FF 10mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 15.2mm
FF 12mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 18.3mm
FF 15mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 22.8mm
FF 18mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 27.4mm
FF 20mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 30.5mm
FF 21mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 32.0mm
FF 24mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 36.6mm
FF 25mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 38.1mm
FF 28mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 42.6mm
FF 35mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 53.3mm
FF 40mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 60.9mm
FF 50mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 76.2mm
FF 55mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 83.8mm
FF 58mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 88.3mm
FF 60mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 91.4mm
FF 65mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 99.0mm
FF 70mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 106.6mm
FF 75mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 114.2mm
FF 90mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 137.1mm
FF 100mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 152.3mm
FF 110mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 167.5mm
FF 125mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 190.4mm
FF 135mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 205.6mm
FF 180mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 274.2mm
FF 200mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 304.6mm
FF 280mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 426.5mm
FF 300mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 456.9mm
FF 400mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 609.2mm
FF 500mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 761.5mm
FF 600mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 913.8mm
Sony Tele Zoom lenses GM 70-200mm, GM 100-400mm and G 200-600mm with and without 1.4x and 2.0x TC's
FF 70mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 106.6mm
FF 70mm Lens + 1.4x TC = 98mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 149.2mm
FF 70mm Lens + 2.0x TC = 140mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 213.2mm
FF 100mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 152.3mm
FF 100mm Lens + 1.4x TC = 140mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 213.2mm
FF 100mm Lens + 2.0x TC = 200mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 304.6mm
FF 200mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 304.6mm
FF 200mm Lens + 1.4x TC = 280mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 426.5mm
FF 200mm Lens + 2.0x TC = 400mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 609.2mm
FF 300mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 456.9mm
FF 300mm Lens + 1.4x TC = 420mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 639.7mm
FF 300mm Lens + 2.0x TC = 600mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 913.8mm
FF 400mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 609.2mm
FF 400mm Lens + 1.4x TC = 560mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 852.9mm
FF 400mm Lens + 2.0x TC = 800mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1218.5mm
FF 500mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 761.5mm
FF 500mm Lens + 1.4x TC = 700mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1066.2mm
FF 500mm Lens + 2.0x TC = 1000mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1523.1mm
FF 600mm Lens = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 913.8mm
FF 600mm Lens + 1.4x TC = 840mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1279.4mm
FF 600mm Lens + 2.0x TC = 1200mm = 60.217344MP's...When the Sensor is Cropped to 25.958400MP's, the new equivalent focal length becomes = 1827.7mm
It's more than possible that I have made a mistake here and there along the way...If you do happen to spot any errors, please feel free to let me know and I will edit/adjust the table accordingly - TIA
Cheers Barry
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k-hawinkler
Well-known member
Thanks Barry.
Of course, your analysis applies for using entire images, as in landscape photography, comparing Fields or Angles of View.
For birding and such one is more interested in the linear resolution one can achieve with a particular setup. When comparing two different camera formats (mMF, FF, APS-C, MFT) and high resolution lenses the question becomes which system results in finer resolution, i.e. more detail captured. That’s easy to figure out by multiplying the ratio of the lens focal lengths FL involved by the inverse of the ratio of the sensor pixel pitches PP.
So R = (FL1/FL2) * (PP2/PP1)
If R = 1 then resolution is the same.
If R > 1 system 1 wins.
If R < 1 system 2 wins.
Well anyway that’s how I think about it.
Of course, your analysis applies for using entire images, as in landscape photography, comparing Fields or Angles of View.
For birding and such one is more interested in the linear resolution one can achieve with a particular setup. When comparing two different camera formats (mMF, FF, APS-C, MFT) and high resolution lenses the question becomes which system results in finer resolution, i.e. more detail captured. That’s easy to figure out by multiplying the ratio of the lens focal lengths FL involved by the inverse of the ratio of the sensor pixel pitches PP.
So R = (FL1/FL2) * (PP2/PP1)
If R = 1 then resolution is the same.
If R > 1 system 1 wins.
If R < 1 system 2 wins.
Well anyway that’s how I think about it.
Last edited:
Barry Haines
Active member
Thank you Bart....What I wrote earlier was indeed a mistake :loco:, so thank you for spotting it
:thumbup: ...The dangers of starting to write this on one day and finishing up at 4:30am BST the next day...I guess :facesmack:"I know it's easier just to say 1.5 times the "True" focal length and be done with it...but I have tried to be a little more accurate than that"
has now been changed to...
"I know it's easier just to say 1.5 times is the focal length and be done with it...but I have tried to be a little more accurate than that"
The "True in camera crop size" (6240 x 4160) that I used was taken from the Sony Specification sheet https://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-7rm4/specifications
See below
Image Size (pixels) [3:2] ....35mm full frame L: 9504 x 6336 (60M), M: 6240 x 4160 (26M), S: 4752 x 3168 (15M) APS-C L: 6240 x 4160 (26M), M: 4752 x 3168 (15M), S: 3120 x 2080 (6.5M)
I am sure that using the 1.5 times rule is more than good enough for most people...I was just trying to write lets say a more accurate guide so people had the answers quickly at their fingertips when comparing one lens against another
For instance the CV65mm lens x 1.5 (rule) = 97.5mm when in fact it's the "equivalent in focal length" of a 99mm lens in camera cropped mode (not much difference I would agree...but none the less it's incorrect).
Cheers Barry
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Thank you K-H, yes I have "not" made it at all clear, that I was referring to a crop made within the A7R4 camera settings at a typical Landscape 3:2 ratio taken from the Sony Specification sheet https://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-7rm4/specifications ...I have just Edited it to hopefully make it more clearer for everybodyThanks Barry.
Of course, your analysis applies for using entire images, as in landscape photography, comparing Fields or Angles of View.
For birding and such one is more interested in the linear resolution one can achieve with a particular setup. When comparing two different camera formats (mMF, FF, APS-C, MFT) and high resolution lenses the question becomes which system results in finer resolution, i.e. more detail captured. That’s easy to figure out by multiplying the ratio of the lens focal lengths FL involved by the inverse of the ratio of the sensor pixel pitches PP.
So R = (FL1/FL2) * (PP2/PP1)
If R = 1 then resolution is the same.
If R > 1 system 1 wins.
If R < 1 system 2 wins.
Well anyway that’s how I think about it.
What you say is equally true when comparing one camera system against another's...There is more to resolution than meets the eye when comparing different camera format sensors with their different pixel pitches and pixel sizes etc...you were right to point that out...Thanks :thumbup:
Cheers Barry
Last edited:
ggibson
Well-known member
Knorp
Well-known member
So instead of 1,5 the "actual" factor is 1,523076923076923 times.Thank you Bart....What I wrote earlier was indeed a mistake :loco:, so thank you for spotting it
"I know it's easier just to say 1.5 times the "True" focal length and be done with it...but I have tried to be a little more accurate than that"
has now been changed to...
"I know it's easier just to say 1.5 times is the focal length and be done with it...but I have tried to be a little more accurate than that"
The "True in camera crop size" (6240 x 4160) that I used was taken from the Sony Specification sheet https://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-7rm4/specifications
See below
Image Size (pixels) [3:2] ....35mm full frame L: 9504 x 6336 (60M), M: 6240 x 4160 (26M), S: 4752 x 3168 (15M) APS-C L: 6240 x 4160 (26M), M: 4752 x 3168 (15M), S: 3120 x 2080 (6.5M)
I am sure that using the 1.5 times rule is more than good enough for most people...I was just trying to write lets say a more accurate guide so people had the answers quickly at their fingertips when comparing one lens against another
For instance the CV65mm lens x 1.5 (rule) = 97.5mm when in fact it's the "equivalent in focal length" of a 99mm lens in camera cropped mode (not much difference I would agree...but none the less it's incorrect).
Cheers Barry
___________________________
Thank you K-H, yes I have "not" made it at all clear, that I was referring to a crop made within the A7R4 camera settings at a typical Landscape 3:2 ratio taken from the Sony Specification sheet https://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-7rm4/specifications ...I have just Edited it to hopefully make it more clearer for everybody
What you say is equally true when comparing one camera system against another's...There is more to resolution than meets the eye when comparing different camera format sensors with their different pixel pitches and pixel sizes etc...you were right to point that out...Thanks :thumbup:
Cheers Barry
F.i. 1,523076923076923 x 600mm = 913,846153846153834
For a 1,5 factor Sony should have cropped to a 26,763264 MB (6336 x 4224) file according to my Japanese calculator that is.
What could have possibly gone wrong ?
Barry Haines
Active member
The Sony A7R2 didn't adhere to your Japanese calculator either (built in 1.500000000000 Factor).
It's a mystery indeed...But I'm totally confident that Sony will sort it out one day with Firmware
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