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Isn´t that a bit misleading to distinguish different crop factors for medium format systems. The 80mm of the classic 6x6 should give the exact same angle of view (and crop factor in regard to the digital back´s sensor size) as does the 80mm lens of the 645 system. The factor only differs in respect to the original film format ratio.Aptus-II 8 uses a 43.9x32.9 sensor, this gives you lens factors of:
1.28 on 645 bodies e.g. Mamiya 645DF
1.44 on 6x6 bodies e.g Hasselblad 503CW
1.63 on 6x7 bodies e.g Mamiya RZ
2.96 on 4x5 cameras (with 4x5 lenses)
Hope this helps
Yair
The lens’s image size,* DOF etc. will be the same on any camera at the same focus point, but the horizontal and vertical field of view covered will vary with the frame size. So an 80mm lens on a Mamiya 645 film camera will show a bit more subject than with a smaller digital sensor, such as the 33 x 44 Leaf mentioned (a tenth of a millimetre? Gimme a break!Isn´t that a bit misleading to distinguish different crop factors for medium format systems. The 80mm of the classic 6x6 should give the exact same angle of view (and crop factor in regard to the digital back´s sensor size) as does the 80mm lens of the 645 system. The factor only differs in respect to the original film format ratio.
Or am I confusing something here?
Oliver
Let’s face it, the 120 square format was perfect for LP cover shots! CDs too.I would agree though that for strict format comparisons there's a little more to it than pure multiplication factors. After shooting 4:3 for a long time 3:2 always feels like an ungainly aspect ratio ... I'm still a sucker for the square format so that probably makes me a dinosaur.
Size of sensor is known. Apart from laymen cams that is all that seems neededbut for some reasons all this information is hidden from a user.
Most of the questions I get are:"So if I get an Aptus-II 8 for my RZ what's my 50mm is going to be like?"Isn´t that a bit misleading to distinguish different crop factors for medium format systems. The 80mm of the classic 6x6 should give the exact same angle of view (and crop factor in regard to the digital back´s sensor size) as does the 80mm lens of the 645 system. The factor only differs in respect to the original film format ratio.
Or am I confusing something here?
Oliver
Btw, once you know how to calculate for diagonals it's trivial to calculate for shifts as well. For example, if you have a 44x33mm sensor and are able to use a 10mm shift or rise in each direction the you can calculate focal length equivalents for a 64x33mm, 44x53mm or even 64x53 for multi-axis shift for the stitched image.Size of sensor is known. Apart from laymen cams that is all that seems needed
I suggest that best is to understand how to calculate for you to know exactly and visualize exactly compared to other format. At times I compare both for vertical and horizontal. How else to compare e.g. 617 to 645 format lens visions?????
... though an 80mm lens is an 80mm lens regardless of sensor size or format as far as optical characteristics are concerned.
Thierry,
Here's a shameless plug for the Alpa mother of all calculation spreadsheets that I use:
http://www.alpa.ch/en/products/tools/alpa-tools/alpa-comparable-focal-length-calculator.html
It's not as simple as the Capture Integration worksheet but if you use shifts, tilts, DoF calculations etc it's ALL here.
Wow! Thanks for sharing this... I hadn't seen it. :thumbup:Thierry,
Here's a shameless plug for the Alpa mother of all calculation spreadsheets that I use:
http://www.alpa.ch/en/products/tools/alpa-tools/alpa-comparable-focal-length-calculator.html