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Fuji GFX 50S • Vignetting of Leica M Lenses

k-hawinkler

Well-known member
When attaching Leica M lenses, designed for a 36x24mm sensor, to the Fuji GFX 50S camera with a 44x33mm (43.8x32.9mm to be precise) sensor, I would like to know the size of image circles M lenses cover. So let's get started with a vignetting study of the Leica Summilux-M 50/1.4 ASPH. The following is an image of the 50/1.4 lens adapted to my GFX 50S.



Sony ILCE-7RM2 + FE 90mm F2.8 Macro G OSS @ ISO 100, FOCAL LENGTH 90.0 mm (90.0 mm in 35mm), APERTURE f/13, EXPOSURE TIME 0.01111s (1/90).

In examining vignetting, we take into account the various image sizes that can be selected in the 50S, now updated to firmware version 3.30.

GFX 50S: 35mm FORMAT NODE: OFF
Ratio = 4/3 • Image Size: 8,256*6,192 = 51,121,152 1.00
Ratio = 5/4 • Image Size: 7,744*6,192 = 47,950,848 0.94
Ratio = 3/2 • Image Size: 8,256*5,504 = 45,441,024 0.89
Ratio = 7/6 • Image Size: 7,232*6,192 = 44,780,544 0.88
Ratio = 1/1 • Image Size: 6,192*6,192 = 38,340,864 0.75
Ratio = 16/9 • Image Size: 8,256*4,640 = 38,307,840 0.75
Ratio = 65/24 • Image Size: 8,256*3,048 = 25,164,288 0.49

GFX 50S: 35mm FORMAT NODE: ON
Ratio = 3/2 • Image Size: 6,768*4,512 = 30,537,216 0.60

The last column shows the relative MP size for the different image formats. The 35mm format image with 36x24mm has 60% as many pixels as the 4/3 full image. That's more than the 65/24 image that uses 49%.

Next we show 8 vignetting images for Minimum Focus Distance (MFD) for f/1.4, 2, 2.8, 4, 5.6, 8, 11, 16 for the full 4x3 image.

MFD f/1.4


MFD f/2


MFD f/2.8


MFD f/4


MFD f/5.6


MFD f/8


MFD f/11


MFD f/16


In the next post we show the corresponding vignetting images for INFINITY (INF) focusing.
 

k-hawinkler

Well-known member
Next we show 8 vignetting images for INFINITY (INF) focusing for f/1.4, 2, 2.8, 4, 5.6, 8, 11, 16 for the full 4x3 image.

INF f/1.4


INF f/2


INF f/2.8


INF f/4


INF f/5.6


IND f/8


INF f/11


INF f/16


In the next post we don't shoot the sky but instead a subject at an intermediate distance.
 
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k-hawinkler

Well-known member
Next we show 8 vignetting images for Intermediate Distance Focusing (IDF) for f/1.4, 2, 2.8, 4, 5.6, 8, 11, 16 for the full 4x3 image.

IDF f/1.4


IDF f/2


IDF f/2.8


IDF f/4


IDF f/5.6


IDF f/8


IDF f/11


IDF f/16


In the next post we show vignetting for f/5.6 and the other than full 4x3 image sizes that the Fuji GFX 50S features.
 

k-hawinkler

Well-known member
Next we show 7 vignetting images for Intermediate Distance Focusing (IDF) for f/5.6 only but for these image formats 4x3, 3x2, 16x9, 1x1, 65x24, 6x4, 7x6.

IDF 4x3


IDF 3x2


IDF 16x9


IDF 1x1


IDF 65x24


IDF 5x4


IDF 7x6


With firmware version 3.30 of the Fuji GFX 50S one can also select a 36x24mm FF area in the middle off the ~44x33 sensor. We have a look at that next.
 

k-hawinkler

Well-known member
Next we show 8 vignetting images for Minimum Focus Distance (MFD) for f/1.4, 2, 2.8, 4, 5.6, 8, 11,16 but for the 36x24mm FF image format.

MFD f/1.4


MFD f/2


MFD f/2.8


MFD f/4


MFD f/5.6


MFD f/8


MFD f/11


MFD f/16


In the next post we repeat this sequence but for INFINITY focusing.
 

k-hawinkler

Well-known member
Next we show 8 vignetting images for INFINITY (INF) focusing for f/1.4, 2, 2.8, 4, 5.6, 8, 11,16 but for the 36x24mm FF image format.

INF f/1.4


INF f/2


INF f/2.8


INF f/4


INF f/5.6


INF f/8


INF f/11


INF f/16


And finally in the next post we look again at Intermediate Distance Focussing.
 

k-hawinkler

Well-known member
Next we show 8 vignetting images for Intermediate Distance Focusing (IDF) for f/1.4, 2, 2.8, 4, 5.6, 8, 11,16 for but for the 36x24mm FF image format.


IDF f/1.4


IDF f/2


IDF f/2.8


IDF f/4


IDF f/5.6


IDF f/8


IDF f/11


IDF f/16


I am curios what conclusions do you draw? :LOL:
 

PeterA

Well-known member
KH - thanks very much for all the trouble you have taken - I have been wondering wether it is worthwhile to get an M adaptor to try on the Fuji. :thumbup::cool:
 

Knorp

Well-known member
It is not surprising that a lens designed to cover 24x36 won't cover 33x44 without vignetting. Also realize that a lens usually performs less well at the edges than it does in the center.
Why didn't I think of that ... :facesmack:
 

k-hawinkler

Well-known member
KH - thanks very much for all the trouble you have taken - I have been wondering wether it is worthwhile to get an M adaptor to try on the Fuji. :thumbup::cool:

Thanks Peter.

Great question, only you know the answer to for yourself.
Using the 65:24 image format stopped down seems to be your best bet.

After the above time consuming exhaustive tests, to check out other Leica M lenses I would first investigate the 65:24 image format. If that doesn't meet or exceed my IQ standard I would stop right there. :banghead:

The Fujinon GF lenses set the IQ bar so very high! :thumbup:
They are good enough for me. :thumbs: :shocked: :LOL:
 

Don Libby

Well-known member
My conclusions are simple..

I tried a Canon 17 TS and liked it however as soon as the GF 23 was released I asked myself why would I use a 35mm lens on a MF camera (other than movements). I've also used a Voigtlander 15 and 21mm for Milky Way shots and while they were wide they too vignette way too much. I stopped using 35mm lenses.

I also used a Mamiya 200 APO with great success (mainly because it's a MF lens) until the GF250 was released.

I still have the 21mm and "might" be tempted to use it again however the 23 is so good I'd have to ask myself why.

The GFX is a great camera system and I like the crop sensor however as great a system it is I simply can't see attempting to use a 35mm lens on it unless it had a frikking huge image circle like the Canon 17TS.

And that's my 2-cents worth.
 

k-hawinkler

Well-known member
My conclusions are simple..

I tried a Canon 17 TS and liked it however as soon as the GF 23 was released I asked myself why would I use a 35mm lens on a MF camera (other than movements). I've also used a Voigtlander 15 and 21mm for Milky Way shots and while they were wide they too vignette way too much. I stopped using 35mm lenses.

I also used a Mamiya 200 APO with great success (mainly because it's a MF lens) until the GF250 was released.

I still have the 21mm and "might" be tempted to use it again however the 23 is so good I'd have to ask myself why.

The GFX is a great camera system and I like the crop sensor however as great a system it is I simply can't see attempting to use a 35mm lens on it unless it had a frikking huge image circle like the Canon 17TS.

And that's my 2-cents worth.

Thanks Don! +1 :thumbs: :thumbs: :thumbs::salute:
 

Knorp

Well-known member
Well, the Sigma Art 135/1.8 (EF-mount) has this large image circle covering the GFX’s censor completely. There’s only a hint of vignetting to be seen.
 

k-hawinkler

Well-known member
Well, the Sigma Art 135/1.8 (EF-mount) has this large image circle covering the GFX’s censor completely. There’s only a hint of vignetting to be seen.
Many thanks Bart. That's good to know and very encouraging. :thumbup:
 

k-hawinkler

Well-known member
The Focal Length (FL) of a lens is what it is! :thumbup:
It doesn't change for different sensor sizes! :thumbup:
What changes with sensor size is the Field of View (FOV) and Depth of Field (DOF) as well as vignetting, if the lens' image circle doesn't cover a larger sensor, such as the ~44x33mm sensor of the Fujifilm GFX 50S.

The Leica WA Tri-Elmar (WATE) 16-18-21/4 and the Fujinon GF 23/4 form an equally spaced series of FLs, namely 16, 18, 21, 23. The difference in size of these two lenses is apparent from the following image.



Fuji GFX 50S + Fujinon GF120mm F4 R LM OIS WR Macro @ ISO 100, FOCAL LENGTH 120.0 mm (95.0 mm in 35mm), APERTURE f/16, EXPOSURE TIME 7.5s (7.5).

On an FF camera, for sample on the Sony A7rII, I would set f to 11 or 13, focus on infinity and be done with focusing of a manual WA lens, such as the Leica WATE (of course, one could also use the TechArt Pro autofocus adapter (TAP) on a Sony FE camera that supports PDAF).

In the following four images, taken with the GFX 50S, the full sensor with an 4x3 aspect ratio was used. The WATE was shot with f of 11 or 13, the GF23 with f/32.

WATE 16mm


WATE 18mm


WATE 21mm


GF23 23mm


Vignetting of the WATE is hard at 16 and 18mm, less obvious at 21mm, but discoloration in the corners still very noticeable.

Of course, the GF23 doesn't suffer from any significant vignetting or discoloration.

As noted before the GFX 50S with firmware version 3.30 lets us also shoot with a FF 36x24mm aspect ratio from the central part of the full ~44x33mm. That should improve vignetting of the WATE.

We then can compare those images with a 3x2 aspect ratio image of the full sensor, taken with the GF23, with an supposedly 135 film equivalent 18mm VOF and DOF.
 
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