p.52 #1 · A thinner sensor stack may be possible after all!
hiepphotog wrote:
Michael,
So I play with this a bit, the problem with seemingly over-saturation of the X-Rite profile is coming from their tone curve. You can solve this problem by using Adobe DNG Profile editor and change the tone curve to linear. Colors accuracy remains the same (IMO) but overall contrast is flatter now. This is probably a good baseline for most people. Adobe profile generator definitely messes up the blue channel.
I'll try making a set with that adjustment next weekend and will add those to the posted set. Thanks for the suggestion.
p.52 #5 · A thinner sensor stack may be possible after all!
Gary Clennan wrote:
Works brilliantly on the A7RII....
Gary,
Please don't tell me that.
It is now becoming much more difficult deciding what to do regarding my A7r. That is do I just use it as a backup un-modded to an A7rII that I purchase in the future or the anticipated Leica AF camera (which I am sure will be very costly along with all of the required adapters for my R, M, and Canon FD lenses). But, the Leica may be able in some way to offer auto aperture for my R glass. Hopefully Leica will have the new camera at PhotoPlus in NYC a little more than a month from now and I can check both that and the A7rII in comparison with my A7r.
p.52 #6 · A thinner sensor stack may be possible after all!
Anyone have the Minolta CLE MC 40mm f2 M-Rokkor lens and an M WATE and an A7rII camera and if so have they checked the performance of both lenses on the A7rII?
p.52 #8 · A thinner sensor stack may be possible after all!
I will see what I can find Charlie. Problem is that I recently sold the lens and don't believe that I have any controlled test shots. I'm sure others have some valuable sample shots for you and will chime in...
p.52 #9 · A thinner sensor stack may be possible after all!
Gary Clennan wrote:
I will see what I can find Charlie. Problem is that I recently sold the lens and don't believe that I have any controlled test shots. I'm sure others have some valuable sample shots for you and will chime in...
I just can't believe you sold all those beautiful Zeiss lenses for a............Sony!
Especially since you often gave me a hard time about them back when
p.52 #10 · A thinner sensor stack may be possible after all!
uhoh7 wrote:
Anyone shooting the ZM25/2.8 on a modded camera?
Me. I have had the ZM25 for quite a while anticipating its use on a M9, after using a M8 a few years ago. Camera technology moves on and it is doubtful I will pursue that line with Sony actively making E mount cameras.
I use the ZM 25 on a Kolari a7 and it is usable and a reasonably priced option. The corner color is gone or minimal and there is slight corner smear at infinity. 2 stops down, at f/5.6 the corners sharpen acceptably. Backing off focus a small amount sharpens the corners even more, giving maximum sharpness without loosing any sharpness central frame.
Having a precise M to E adapter that gives perfect hard stop infinity at wide open apertures, as I do, will tell a lot about field curvature. The fact that the corners can be sharpened by backing off focus indicates field curvature goes out toward infinity (in the case of thick filter stacks on Sony cameras). This is surely from the more symmetrical design of M mount lenses on Sony cameras and can play havoc with the peripheral bokeh when subject is close distance relative to infinity as illustrated by Jako ZM35/1.4: http://www.kozera.ca/photos/images/20150830_0024_640.jpg
The ZM25 also exibits this effect and should be considered by the shooter as desirable or not an issue. The Leica M 24/3.8 needed no focus back off in the corners for more sharpness on the a7M. This suggests Leica's design is more retrofocus to cater to the digital sensors. Mention of the Leica Elmar 24 flat field has been made by hiepphotog, also.
At the moment, I'm trying to sort out the subject isolation effects of the M mount lenses on Sony cameras that have the field curvature effect of producing sharp central subjects against good central bokeh, but sharper focus edge bokeh.
p.52 #11 · A thinner sensor stack may be possible after all!
JimBuchanan wrote:
Me. I have had the ZM25 for quite a while anticipating its use on a M9, after using a M8 a few years ago. Camera technology moves on and it is doubtful I will pursue that line with Sony actively making E mount cameras.
I use the ZM 25 on a Kolari a7 and it is usable and a reasonably priced option. The corner color is gone or minimal and there is slight corner smear at infinity. 2 stops down, at f/5.6 the corners sharpen acceptably. Backing off focus a small amount sharpens the corners even more, giving maximum sharpness without loosing any sharpness central frame.
Having a precise M to E adapter that gives perfect hard stop infinity at wide open apertures, as I do, will tell a lot about field curvature. The fact that the corners can be sharpened by backing off focus indicates field curvature goes out toward infinity (in the case of thick filter stacks on Sony cameras). This is surely from the more symmetrical design of M mount lenses on Sony cameras and can play havoc with the peripheral bokeh when subject is close distance relative to infinity as illustrated by Jako ZM35/1.4: http://www.kozera.ca/photos/images/20150830_0024_640.jpg
The ZM25 also exibits this effect and should be considered by the shooter as desirable or not an issue. The Leica M 24/3.8 needed no focus back off in the corners for more sharpness on the a7M. This suggests Leica's design is more retrofocus to cater to the digital sensors. Mention of the Leica Elmar 24 flat field has been made by hiepphotog, also.
At the moment, I'm trying to sort out the subject isolation effects of the M mount lenses on Sony cameras that have the field curvature effect of producing sharp central subjects against good central bokeh, but sharper focus edge bokeh.
Quite a spot-on analysis there Jim. I also observed that as you focus closer, the field curvature would get more severe even though the lens might have a relative flat field curvature at infinity (no focus back off as you say for the corners). I have seen this on all of the lenses I have tested, definitely more visible with longer focal and wider aperture. I don't know if this behavior would be visible on a Leica platform as well.
p.52 #12 · A thinner sensor stack may be possible after all!
mdemeyer wrote:
I'll try making a set with that adjustment next weekend and will add those to the posted set. Thanks for the suggestion.
Michael
By the way Michael, got another suggestion that I can just tone-down the default X-Rite curve (the same as Adobe Std. curve). Here is what I found would yield good result without being too flat with the linear tone curve.
p.52 #13 · A thinner sensor stack may be possible after all!
uhoh7 wrote:
I just can't believe you sold all those beautiful Zeiss lenses for a............Sony!
Especially since you often gave me a hard time about them back when
Seriously, looking forward to your work with r2
Haha - thanks for the hard time Charlie. Funds are limited and I needed to sell a few lenses to buy some others for the Sony. It was a hard decision. However, I still have a long way to go with trying out the Sony and have yet to really gel with it. I certainly don't (yet) feel as connected with it as I do with the Leica but the results are very good. I am trying to keep the Leica kit simple and go 21-35-50-90 and see how it works. I will also likely pick up a 28cron in the winter time as I've always wanted to try it out.
p.52 #14 · A thinner sensor stack may be possible after all!
Folks,
Finally got round to making the Tungsten and Dual-Illuminant profiles for the BG39 version of the Kolari modified Sony A7. You can get them, as well as the original Daylight profiles at:
to be picked up by Camera Raw or LightRoom. You might have to unhide the folders if you don't see the AppData folder in your user folder.
I recommend the Dual-Illuminant profile. They do seem to give the same result as the single-illuminant profile under the proper lighting conditions, and the Daylight profile is pretty whacky under Tungsten light (as expected).
In my earlier post I commented that I thought the colors were a bit saturated with these profiles. After more extensive use, I think this was just me using Camera Neutral for a long time, which is quite unsaturated. I still dial back the saturation a little with these, but I think it's more about personal taste than absolute correctness.
As always, feedback is appreciated.
I'm going to get my camera upgraded to the later glass so I can make a set of profiles for these and also test out something in the works... stay tuned!
p.52 #16 · A thinner sensor stack may be possible after all!
naturephoto1 wrote:
Anyone have the Minolta CLE MC 40mm f2 M-Rokkor lens and an M WATE and an A7rII camera and if so have they checked the performance of both lenses on the A7rII?Rich
I have an unmodded A7RII and an M-Rokkor 40/2. Is that the combination you're interested in and, if so, what sort of test would be useful for you?
p.52 #17 · A thinner sensor stack may be possible after all!
genji wrote:
I have an unmodded A7RII and an M-Rokkor 40/2. Is that the combination you're interested in and, if so, what sort of test would be useful for you?
