p.9 #1 · A thinner sensor stack may be possible after all!
sebboh wrote:
but the modified camera clearly should be better with a lens designed for film (such as leica R lenses) than the unmodified camera with the same lens designed for film, which is what steve and i were saying.
This way yes.
I was answering with naturephoto1s question in mind with his Leica R lenses behavior on A7 unmodifed to A7 modified - there will be nearly no effect due to SLR design and slow f-stop. But yes they will be slightly better on the modified camera.
p.9 #2 · A thinner sensor stack may be possible after all!
uhoh7 wrote:
I can't agree. I don't doubt it can make some fun images closer in, but at infinity, with distant objects things are pretty disappointing on the edges. https://farm3.staticflickr.com/2810/11213475035_e075814773_b.jpg DSC01880 by unoh7, on Flickr
if you open the full compare this f/8 image edge trees on first ridge with houses in center frame. To be fair, even on M9 this lens needs to stop way down for great edges. The 28 cron kills it in that way.
p.9 #5 · A thinner sensor stack may be possible after all!
Hi Guys,
I don't have an upload account here so I'll post a link to some shots made before and after my A7 conversion with three lenses:
- 24mm Elmar 3.8
- 35mm Summicron IV
- 50mm Summicron V (current, not APO)
The subject matter is boring, but useful. The folder contains a set of Full Frame images with each lens, before and after, at f5.6 (names start with FF) and crops of the upper left corner 1:1 as follows:
24mm Elmar - f3.8, f4, f5.6, and f8
35mm and 50mm Summicron - f2, f2.8, f4, f5.6, and f8
The file names should be self-explanatory. Focus was on the building in the center of the frame with each lens wide open.
Version IV of the 35mm Summicron isn't great in the corners on anything I have seen, but still interesting. I didn't correct for fall-off and the light was from the right, so the right-lower corner (I had the horizon cutting the corners) is a bit dark.
Lloyd's technique, subject matter, and use of an A7r provide a better test, but this should be informative. Also, my framing of the 24mm Elmar shots was off a bit, but the light was gone before I realized it. The Summicron's are pretty close.
If someone with an upload account on FM wants to pull them down and post here, it will make it easier for everyone.
p.9 #6 · A thinner sensor stack may be possible after all!
Pretty impressive improvement with the 24 Elmar.
I suspect the 35 Cron IV isn't a great lens for this kind of use to begin with, but centrally it looks a lot sharper after the mod.
I think there's even some peripheral improvement with the 50. Very subtle, but there.
Thanks for doing the test and getting this project off the ground!
p.9 #7 · A thinner sensor stack may be possible after all!
Thank Michael Agree with Ron's assessment here ... of course! The 24 Elmar looks very good. I will interested in the improvements with the 50 Lux Asph. The 35 Cron IV looks to have more issues.
I should have my A7rM in about a week. Maybe the A7rM will behave differently.
p.9 #8 · A thinner sensor stack may be possible after all!
rscheffler wrote:
Pretty impressive improvement with the 24 Elmar.
I suspect the 35 Cron IV isn't a great lens for this kind of use to begin with, but centrally it looks a lot sharper after the mod.
I think there's even some peripheral improvement with the 50. Very subtle, but there.
Thanks for doing the test and getting this project off the ground!
Yes, the 24mm Elmar is a go-to wide for me, so I'm really pleased with the improvement there!
p.9 #10 · A thinner sensor stack may be possible after all!
Update on the concern raised earlier in this thread as to whether the A7m might have filter stack reflections when shooting into lights at night, as was seen by some people with the original (stock) A7. I took some shots tonight of neighborhood street lights and didn't see anything that seemed problematic. More testing by more people is good, but nothing jumped out at me.
p.9 #13 · A thinner sensor stack may be possible after all!
Stock A7 is really poor in that regard, I have some trouble with it even in interior shots. It's much worse than A7R. It would be great to show some night shots with the "m" or some shots with sun inside
p.9 #15 · A thinner sensor stack may be possible after all!
mdemeyer wrote:
Update on the concern raised earlier in this thread as to whether the A7m might have filter stack reflections when shooting into lights at night, as was seen by some people with the original (stock) A7. I took some shots tonight of neighborhood street lights and didn't see anything that seemed problematic...
Is that BG39 glass directly glued on the sensor surface (sensor cover glass)?
p.9 #16 · A thinner sensor stack may be possible after all!
My A7M just arrived. Was so excited I shot under bad overcast, jpg, with strange WB so I will hold off posting except something simple. I think some setting were changed in testing at Kolari, which would be expected.
I shot ZM18 and it looks pretty good, albeit with expected colorcast.
p.9 #17 · A thinner sensor stack may be possible after all!
Likewise, my A7R has arrived just in time for an upcoming family event (thanks Ilija!) and a quick and dirty comparison of stock/modded versions with Zeiss Biogon ZM 2/35 and Leica-M Summilux asph shows that the upgrade was well worth every penny, just for the Lux 50 itself.
p.9 #19 · A thinner sensor stack may be possible after all!
JaKo wrote:
Likewise, my A7R has arrived just in time for an upcoming family event (thanks Ilija!) and a quick and dirty comparison of stock/modded versions with Zeiss Biogon ZM 2/35 and Leica-M Summilux asph shows that the upgrade was well worth every penny, just for the Lux 50 itself.
That looks very good. Please if possible, also run some tests with some R lenses as well as M mount lenses so that I have some peace of mind before I consider making the modification.
? You're pushing me hard now...
