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Archive 2012 · Medium format lenses converted on 35mm digitals.
  
 
contas
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p.4 #1 · p.4 #1 · Medium format lenses converted on 35mm digitals.


MF photography left itís peak of prosperity behind.
MF lenses are reduced to manufacture these days, while digital back for MF cameras are too scarce and very expensive, they have no way to compete with 35mm digitals, in short they are dying.But they have the best ever made optics, that made many and many renown names of photographer in the past. If we could use some selective lenses ALT way on 35mm digitals, we can reach many goals.This trail not many people go so it must be rough, but the reward is invaluable, at least it helps man to master photography theories and practices and overcome the tech-shy nature .
MF lens has bigger image circle, so 35mm digital sensor only takes the best central part of the lens, while left the peripheral weaknesses out .
MF lenses are in generations, not all suitable to adapt to the flexible 35mm body, unless you want it that way.
Which are MF are desirable:
- Hasselblad, Zeiss optics and manual aperture .The adapter is available for some mounts.Very expensive but the best optically .
- Mamiya, manual aperture.Japan excellent optics. The adapter is available for some mounts.The best choice of amateur ( I am included).
- Contax 645, Zeiss optics, autofocus for most lenses,electronic aperture- very difficult to do conversion, but some people Ďve already done that task.Expensive, not stable, but the fastest performance Zeiss lens- in photography, the fastness might be the best. But on the market there is the iris- replacement adapter , DOF may not be as desirable ,bícause diaphragm is behind the rear element, using it may limit some Zeiss characters certaintly.
- Rolleiflex 6000, Zeiss optics, autofocus, electronic aperture- very difficult to do conversion, personally donít see any conversion.Waiting for heroes.
- Russian, East Gemany MF lenses : these lenses are in variable quality and must have an individual selection, I myself luckily found Mir 26B 45mm.Tilt /shift or tilt adapters are available for many mounts.If the copy is excellent this is the smartest, the most affordable and the most creative way of conversion.
- All the above MF lenses have helical mechanism, others need the bellows to make focus, that I donít mention here, although they are really good too.
- I cannít add any more , I would be grateful if someone can help this discussion go right and further.





Jan 04, 2013 at 02:40 AM
RustyBug
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p.4 #2 · p.4 #2 · Medium format lenses converted on 35mm digitals.


Another aspect of using MF glass on FF or crop ... you can mostly kiss vignetting good-bye due to the oversized image circle as well as the better uniformity of transitions.

Granted ... those are a couple of things that some people like to see in their images as being indicative of "character" (nothing wrong with that), but for those who want "evenness" across the frame, the MF glass can be a new realm. There might be some initial contrast difference between using MF glass vs. some smaller formats with closer registration distances and smaller image circles ... but the smoothness of transitions tolerate PP nicely, imo.

When I want "punchy" or "contrasty" ... I grab for my 35mm C/Y or Nikon. When I want smooth and even (neutral, if you will) ... M645. Oly & Leica fall somewhere in between with their own renderings @ color.



Jan 04, 2013 at 05:49 PM
Lee Saxon
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p.4 #3 · p.4 #3 · Medium format lenses converted on 35mm digitals.


Id really love to get a Hassy Sonnar 180/4 to compare to my Nikon 180/2.8 AI-s


Jan 04, 2013 at 06:14 PM
JohnJ
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p.4 #4 · p.4 #4 · Medium format lenses converted on 35mm digitals.


RustyBug wrote:
Another aspect of using MF glass on FF or crop ... you can mostly kiss vignetting good-bye due to the oversized image circle as well as the better uniformity of transitions...


On the subject of vignetting, when I compared a Leica R 80/1.4 to a medium format Mamiya 80/2.8 the Leica R had virtually no vignetting at F2.8 (because it was already stopped down 3 stops) compared to the Mamiya. I was surprised as I also expected the medium format lens to be superior but maybe some fast lenses still have an edge.



Jan 04, 2013 at 09:46 PM
RustyBug
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p.4 #5 · p.4 #5 · Medium format lenses converted on 35mm digitals.


IMO, most lenses operating @ WO are a bit of a "stretch" in retaining optimal IQ from "overly optimistic" engineers ... compromising various aspects (vignette, resolution, contrast, etc.) for exposure.

Thus stopping down 3 stops on the Leica comes as no surprise that it would be playing nice compared to the Mamiya @ WO @ 2.8



Jan 04, 2013 at 10:44 PM
contas
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p.4 #6 · p.4 #6 · Medium format lenses converted on 35mm digitals.


@RustyBug: the evenness is right discovery of MF lens on 35mm, it gives the natural , calm and not tension look. The high resolution MF lens avoids the "busy" or false details when it matches the sensor's resolution.
Here is the Bird Cafe: people bring their birds , let them singing, listening while chating and sipping coffee.Young caged birds must be brought there to learn to sing well.
Mir 26B 45mm, @11.0 on Sigma SD1 Merrill Iso 200, 1/60s handheld.No AF confirm.



Jan 05, 2013 at 04:53 AM
glacierpete
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p.4 #7 · p.4 #7 · Medium format lenses converted on 35mm digitals.


contas
The level of detail the Sigma SD1 Merrill pulls out of the Mir 45 is incredible.
I do have a DP2M and love to use my Leica 90 Tele Elmarit on it



Jan 05, 2013 at 06:36 AM
JohnJ
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p.4 #8 · p.4 #8 · Medium format lenses converted on 35mm digitals.


RustyBug wrote:
IMO, most lenses operating @ WO are a bit of a "stretch" in retaining optimal IQ from "overly optimistic" engineers ... compromising various aspects (vignette, resolution, contrast, etc.) for exposure.

Thus stopping down 3 stops on the Leica comes as no surprise that it would be playing nice compared to the Mamiya @ WO @ 2.8


So if vignetting was an important consideration then a fast lens that can be stopped down may be a better choice than a medium format lens which is already relatively slow. If you start at F2.8 and need to stop down further to improve vignetting then you might be in an aperture range you don't want to be in.

My point is just that any advantages re vignetting are modest and not a significant 'selling point' for mediun format glass IMHO, there are better options.

Leica R 80/1.4 Vignetting (F1.4-F8):






Mamiya 80/1.9 N Vignetting (F1.9-F8):






Mamiya 80/2.8 N Vignetting (F2.8-F8):






In the above examples the very centre of each test image is exactly the same as the border around them.

Edit: I should point out that these where all shot on a 5D2.


Edited on Jan 07, 2013 at 04:27 AM · View previous versions



Jan 05, 2013 at 09:23 AM
contas
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p.4 #9 · p.4 #9 · Medium format lenses converted on 35mm digitals.


How about MF lens vignette issue on 35mm camera?
We all know vignette and distortion are the major optical judgements of a lens beside MTF analysis.In fact that MF has no larger physically than small format lens, but itís design ensures the larger image circle so the vignette must be controlled better than small format lens Ė that must be like that as theory.
How about practice?, I have no doubt that Jonhjís demonstration is genuine- sure itís true, but right here may occur an individual issue: some small format lenses may have better vignetting control than MF lens.
I imitated Johnj did mine:
SA mount converted contax N 28-80mm F/3,5-5,6 at 45mm and SA mount converted Mir 45mm f/3,5 on Sigma SD1 Merrill .The vignette on Foveon is always critical than ever other sensor, as fotons have to penetrate through 3 layers to create colors and microlens plate design somehow worsens the existing vignette, resulting not like the most other sensor vignetting only causes darkening corners, Foveon ( excludes SD9 Foveon ) and some like M8,M9, NexÖ causes color shift or also called green/magenta edges.
Here are the results:





































Explanation:1-6 are Contax N 28-80mm at 45mm
f/3,5 to f/4,0,f/4.5,f/5.0,f/5,6,f/6,3
and the last Mir 26B 45mm at WO f/3,5.I can't believe it but the fact is found. Mir a little different from 645 that it covers 6X6.



Jan 07, 2013 at 02:42 AM
contas
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p.4 #10 · p.4 #10 · Medium format lenses converted on 35mm digitals.


Thanks to glacierpete, I love Foveon since I found SD9, now I have 2 SD9 for reservation of a very old and extinct camera- it has only Iso 400 max , has no microlens and low resolution of 3,4 MPx each layer, but it's nature-loyal no other digital sensor can surpass.I love SD1 of it's resolution and want it in FF and again no microlens so no green/magenta edges and return to realistic as SD9 but with 60mpx resolution.I concern about lenses for my SD1 now, most of them are Zeiss converted and found that MF are better.


Jan 07, 2013 at 03:11 AM
 

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contas
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p.4 #11 · p.4 #11 · Medium format lenses converted on 35mm digitals.


Here again the beauty of the Nature, the Lotus, this image is untouched intentatively to show how excellent Apo-Makro-Planar and how brilliant Foveon Merrill.
Apo-Makro-Planar 120mm f/4, @4.0 on Sigma SD1 Merrill, Iso 125, 1/2000s.


Edited on Jan 15, 2013 at 07:50 AM · View previous versions



Jan 14, 2013 at 07:30 AM
contas
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p.4 #12 · p.4 #12 · Medium format lenses converted on 35mm digitals.


This image with MF bokeh, all settings are the same.



Jan 14, 2013 at 08:42 AM
mpmendenhall
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p.4 #13 · p.4 #13 · Medium format lenses converted on 35mm digitals.


Snow and the Zeiss/Hasselblad 250/5.6 SA:



















Jan 14, 2013 at 06:35 PM
contas
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p.4 #14 · p.4 #14 · Medium format lenses converted on 35mm digitals.


Hasselblad , woa, but Canon seems not comes along with that level.I wish to see a "sugar" surface, sparkles under winter scattered sunlight.


Jan 15, 2013 at 05:30 AM
_julian_
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p.4 #15 · p.4 #15 · Medium format lenses converted on 35mm digitals.


Those Lotus photos show incredible detail and clarity not to mention color. As I understand it, the Foveon doesn't require a low-pass filter either. Very impressed!


Jan 15, 2013 at 06:30 AM
mpmendenhall
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p.4 #16 · p.4 #16 · Medium format lenses converted on 35mm digitals.


contas wrote:
Hasselblad , woa, but Canon seems not comes along with that level.I wish to see a "sugar" surface, sparkles under winter scattered sunlight.


Even Hasselblads aren't good enough to coax the sun out from under clouds --- the lighting in these images actually was very flat and sparkle-free.



Jan 15, 2013 at 06:48 AM
contas
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p.4 #17 · p.4 #17 · Medium format lenses converted on 35mm digitals.


Thanks Julian, Foveon has no A-A filters and full 100% each of three colors
(Bayer 50%-25%-25%), no interpolation is needed, so it gives a shorter way to reproduce the Nature, beside that, Apo-Makro-Planar is one of the best Zeiss's lenses .



Jan 15, 2013 at 07:49 AM
contas
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p.4 #18 · p.4 #18 · Medium format lenses converted on 35mm digitals.


@mpmendenhall: I mean about the last image, there are some sparkling, but if the shooting angle was lower and if Canon "can" this pic would shine regardless of winter.


Jan 15, 2013 at 08:03 AM
mirkoc
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p.4 #19 · p.4 #19 · Medium format lenses converted on 35mm digitals.


Here is a recent one with CSJ Sonnar MC 180/2.8:








Jan 15, 2013 at 09:26 AM
contas
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p.4 #20 · p.4 #20 · Medium format lenses converted on 35mm digitals.


Very nice mirkoc.


Jan 15, 2013 at 11:21 AM
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