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Archive 2018 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

naturephoto1
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p.1 #1 · p.1 #1 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

I am running tests of my "new" 35 to 40? year old Minolta 28mm f2.8 M-Rokkor lens that was just delivered on Friday, December 18. This is supposed to be the smallest and lightest M-mount 28mm lens that can produce well on an A7r camera (the lens weighs 5.8oz including the UV filter, Minolta Bayonet hood, and front and rear caps). I was lucky enough to find a lens lacking the dreaded white spots/bubbles. The first tests are with my lens on my A7r V3 thin sensor Kolari modded camera (.8 mm sensor cover; total thickness of the sensor stack should be 1.3mm).

The first set of images were taken right out of my rear kitchen sliding door. This is looking basically from the second floor since there is a walk out basement. The view is across my rear lawn, past the near fencing, across the retention pond and the fencing on the far side of the retention pond. Beyond the trees and fencing there is a creek, beyond which is a farmers field and beyond that are homes and the small US Post office for our area of our town. I believe the flag pole is at the rear of the Post Office, but don't hold me to it. Focus was made on the deciduous trees beyond the far side of the fencing and the total distance is hundreds of feet to the homes at the rear of the image.

The lens was mounted on my Hawk's Factory V5 Helicoid and the camera was tripod mounted. I can not guarantee that the camera was totally parallel when taking the images. ISO of the exposures was 100. The photos are right out of the camera relying on the camera defaults in LR 6.14 with the exception being that the color was adjusted to the profile that I had made for the new sensor stack. The only other thing that was done to the images was to adjust the size of the images and to save the files in JPEG form.

The images are marked and were taken at f2.8, f4, f5.6, f8, and f11.

More test images will come with the lens on this camera as well as on my stock A7r and my stock A7RIII.

Rich

Minolta 28mm f2.8 M-Rokkor, A7r V3; ISO 100, f2.8, 1/1600s

Minolta 28mm f2.8 M-Rokkor, A7r V3; ISO 100, f4, 1/1250s

Minolta 28mm f2.8 M-Rokkor, A7r V3; ISO 100, f5.6, 1/800s

Minolta 28mm f2.8 M-Rokkor, A7r V3; ISO 100, f8, 1/320s

Minolta 28mm f2.8 M-Rokkor, A7r V3; ISO 100, f11, 1/160s

Dec 23, 2018 at 03:33 PM

naturephoto1
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p.1 #2 · p.1 #2 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

Looking at the first set of images, I am not sure if I was off slightly on focus, or I was just experiencing focus fall off from such a long distance of focus to the nearer distances in the image or there is an issue with the Hawk's Factory V5 Helicoid. I suspect the Hawk's Factory Helicoid is OK since I have never noticed an issue before using my other M-mount lenses.

I ran 2 quick images this morning in the kitchen with the Minolta 28mm f2.8 M-Rokkor mounted on my "new" Novoflex Leica M to NEX adapter mounted on my A7r V3 Kolari thin sensor modded camera. The camera was tripod mounted. Images are straight out of the camera with no color profile correction (mix of sunlight coming into the kitchen and incandescent light). The images were only adjusted for size of the images and the files were saved in JPEG form.

The 2 images are marked and the first image was taken at f8 and the second at f11. The lens looks quite sharp at least at f8 and f11 and relatively close-up.

I hope to get out later today and to take some distance images perhaps approaching infinity and possibly other images with all 3 cameras, the A7r V3, A7r stock, and A7rIII stock cameras.

I will post additional images as they become available.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 4s

Minolta 28mm f2.8 M-Rokkor, Novoflex Adapter A7r V3; ISO 100, f11, 8s

Dec 29, 2018 at 08:44 AM

realVivek
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p.1 #3 · p.1 #3 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

Any infinity test is best done with a fixed (non focusing) adapter.

Your kitchen shots clearly show color shifts.

Dec 29, 2018 at 08:59 AM

naturephoto1
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p.1 #4 · p.1 #4 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

realVivek wrote:
Any infinity test is best done with a fixed (non focusing) adapter.

Your kitchen shots clearly show color shifts.

When I applied the new thin sensor stack color profiles for daylight and shade to the images there was only a very small change in the color of the images. So, I just left them in Adobe Standard in LR 6.14. But, as I indicated, the images were taken this morning at about about 7:54 AM with sunlight coming into the kitchen from the S S/W with the curly flourescent bulb in our light. So, yes the combination should have some color shift. Also at the time, the color in the images appeared close to what I was seeing of the scene by eye (but that is not accurate).

Rich

Dec 29, 2018 at 09:09 AM

Juha Kannisto
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p.1 #5 · p.1 #5 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

I also have the M-Rokkor 28/2.8 (another clean copy without any white spots) as well as the other 2 M-Rokkors 40/2 and 90/4. I like them all pretty much, though I haven't been using them so much recently. My 28/2.8 is sharp centrally at all apertures but best corner-to-corner results at infinity require f8 or so. It has very nice 10-pointed sunstars too.

Some of my photos taken with the M-Rokkor 28/2.8 on A7II and A7r (all have some PP done):
https://plus.google.com/%2BJuhaKannisto/posts/DKv2ak4wA4n
https://plus.google.com/%2BJuhaKannisto/posts/cWw4Jau9wNu
https://plus.google.com/%2BJuhaKannisto/posts/jCZSUVFk4SK (mixed with Ḿ-Rokkor 40/2 shots)
https://plus.google.com/%2BJuhaKannisto/posts/RBc8mNBwDXu
https://plus.google.com/%2BJuhaKannisto/posts/KMSk1yqdLQs

There's also another small (even smaller and lighter) legacy RF lens that works rather well on A7/A9 series: Avenon (Kobalux) 28/3.5. I also have one of those.

Dec 29, 2018 at 09:58 AM

naturephoto1
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p.1 #6 · p.1 #6 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

Juha Kannisto wrote:
I also have the M-Rokkor 28/2.8 (another clean copy without any white spots) as well as the other 2 M-Rokkors 40/2 and 90/4. I like them all pretty much, though I haven't been using them so much recently. My 28/2.8 is sharp centrally at all apertures but best corner-to-corner results at infinity require f8 or so. It has very nice 10-pointed sunstars too.

Some of my photos taken with the M-Rokkor 28/2.8 on A7II and A7r (all have some PP done):
https://plus.google.com/%2BJuhaKannisto/posts/DKv2ak4wA4n
https://plus.google.com/%2BJuhaKannisto/posts/cWw4Jau9wNu
https://plus.google.com/%2BJuhaKannisto/posts/jCZSUVFk4SK (mixed with Ḿ-Rokkor 40/2 shots)
https://plus.google.com/%2BJuhaKannisto/posts/RBc8mNBwDXu
https://plus.google.com/%2BJuhaKannisto/posts/KMSk1yqdLQs

There's also another small (even smaller and lighter) legacy RF lens that works rather well...Show more →

Hi Juha,

Thank you. I was made aware of the Avenon lens when mentioned by hiephoto not long ago. Yes, I know that it may be smaller and lighter still than the Minolta 28mm f2.8 M-Rokker, but since it is a LTM lens I would need an adapter for the LTM to Leica M or an LTM directly to NEX adapter. Additionally these lenses are not as easy to find in a MC form as the uncoated or single coated form as the Minolta.

I was also aware that you also had the Minolta 28mm M-Rokkor. Thank you for providing the links. I had been unable to find some of your postings.

My intent largely for the lens is for landscape work (when I do not want to carry my Leica R 28mm f2.8 V2 which is much larger and heavier) and a very small and light portable package often with my Minolta 40mm f2 CLE MC M-Rokkor lens.

Rich

Dec 29, 2018 at 10:07 AM

Juha Kannisto
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p.1 #7 · p.1 #7 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

naturephoto1 wrote:

Hi Juha,

Thank you. I was made aware of the Avenon lens when mentioned by hiephoto not long ago. Yes, I know that it may be smaller and lighter still than the Minolta 28mm f2.8 M-Rokker, but since it is a LTM lens I would need an adapter for the LTM to Leica M or 39mm thread directly to NEX. Additionally these lenses are not as easy to find in a MC form as the uncoated or single coated form as the Minolta.

I was also aware that you also had the Minolta 28mm M-Rokkor. Thank you for providing the links....Show more →

Thanks! You mean some of the links didn't work for you? All the links worked OK in my environment when I tried, not sure why that would happen or what would be needed to fix that...

Yeah, I guess those Avenons could be even harder to find that a clean M-Rokkor 28/2.8 especially outside of Japan and it does need a small LTM to M adapter ring to work with M-to-E adapters. Mine is from the first generation and it doesn't have any MC coating indication on the lens but whatever coatings it has are surprisingly effective when shooting against light. It has some hard vignetting in the extreme corners though which would probably not be great for landscape photography (or might require slight cropping).

I don't really do landscape shooting myself (though I shoot cityscapes etc.) so I haven't really used my M-Rokkor for that specific purpose either, but I think it could be workable at f8 or so and will pair nicely with the 40/2 M-Rokkor for sure

Dec 29, 2018 at 10:32 AM

naturephoto1
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p.1 #8 · p.1 #8 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

I was able to go out and take photos with the Minolta 28mm f2.8 M-Rokkor on my Novoflex Leica M to NEX adapter on all 3 cameras- A7r V3 Kolari thin sensor, A7r Stock, and A7rIII stock cameras. Conditions were somewhat windy and very cloudy so lighting was not the best until the last set of images with the A7rIII when the sun started to break through somewhat and we were into magic hour. I set up each camera mounted on my tripod and took my 5 shots at f2/8. f4. f5.6. f8, and f11. I then went back to the car and remounted the lens on the next camera and went back for the next series of shots. I did not want to chance getting something blown into the camera body and onto the sensors.

At this point, I am finding results from a distance similar to what I observed photographing out my rear Kitchen sliding door with the lens. At least with the amount of depth to the image and still including some of the image substantially closer to the camrera the lens is demonstrating much more smearing than I had hoped or wanted at least till approaching the f8 settings.

One thing that I found interesting was that the lens on the Novoflex Adapter focused at a little or more distance to infinity with the different cameras. The A7r V3 which Kolari had adjusted focus and adjusting the sensor for alignment was closer to the focus of the A7rIII. The stock A7r had greater distance to focus to infinity.

Focus was made on the deciduous trees near the center of the images.

The first set of images were taken with my A7r V3 Kolari thin sensor modded camera and photos are right out of the camera relying on the camera defaults in LR 6.14 with the exception being that the color was adjusted to the profile that I had made for the new sensor stack. The only other thing that was done to the images was to adjust the size of the images and to save the files in JPEG form.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f2.8, 1/320s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f4, 1/200s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f5.6, 1/100s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s

Dec 29, 2018 at 08:58 PM

naturephoto1
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p.1 #9 · p.1 #9 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

The second set of images were taken with my stock A7r camera and photos are right out of the camera relying on the camera defaults in LR 6.14 with the exception being that the color was adjusted to cloudy. The only other thing that was done to the images was to adjust the size of the images and to save the files in JPEG form.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f2.8, 1/640s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f4, 1/400s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f5.6, 1/250s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f11, 1/80s

Dec 29, 2018 at 09:10 PM

naturephoto1
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p.1 #10 · p.1 #10 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

The third set of images were taken with my stock A7rIII camera. Lighting had changed with the sun breaking through the clouds in part and photos are right out of the camera relying on the camera defaults in LR 6.14 with the exception being that the color was adjusted to cloudy. The only other thing that was done to the images was to adjust the size of the images and to save the files in JPEG form.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f2.8, 1/60s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f4, 1/30s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f5.6, 1/15s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f8, 1/8s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f11, 1/5s

Dec 29, 2018 at 09:20 PM

Samuli Vahonen
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p.1 #11 · p.1 #11 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

Rich, sorry to see this lens did not work as you hoped for, even f/8 and f/11 corners seems to have much weaker microcontrast. Basically all extreme small rangefinder lenses are very difficult on all digital sensors. This is because making lens small is mostly based on using symmetrical design instead of retrofocus/telecentric design, and when focal length is short the symmetrical lens has to be very close to sensor => the light hits sensor in very high angles.

Due to this Leica had to generate new versions from most of their lenses even their sensor cover glass is very thin compared to Sony. And after Leica changed little thicker cover glass (still thinner or similar than Kolari UT) in new M-cameras and SL they again generated new versions from some of their lenses.

This lens might work well with front correction filter as field curvature seems to be widespread and not just affecting extreme corner progressively. This naturally would require possibility to modify focus mechanism to go past infinity. However I'm not sure is it worth the effort as lens doesn't seem to have great rendering style (e.g. compared to Leica R 28mm f/2.8 v2 or Zeiss 2.8/28 C/Y). If using front correction filter then Zeiss G-series 28mm on your Kolari UT camera would be much better from image generation point of view, and not much larger, but from usability point of view would be worse due to focusing mechanism in G-series (unless modified like Derek/sebboh has done for his lens).

naturephoto1 wrote:
One thing that I found interesting was that the lens on the Novoflex Adapter focused at a little or more distance to infinity with the different cameras. The A7r V3 which Kolari had adjusted focus and adjusting the sensor for alignment was closer to the focus of the A7rIII. The stock A7r had greater distance to focus to infinity.
I have 5pcs A7-series cameras and due to gigantic tolerance of sensor-mount distance they are all having different infinity focus points, except the two which have been modified (and obviously calibrated) by Kolari. Before sending the two A7-cameras to Kolari also they had different sensor-mount distance.

Samuli

Dec 30, 2018 at 01:31 AM

naturephoto1
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p.1 #12 · p.1 #12 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

Samuli Vahonen wrote:
Rich, sorry to see this lens did not work as you hoped for, even f/8 and f/11 corners seems to have much weaker microcontrast. Basically all extreme small rangefinder lenses are very difficult on all digital sensors. This is because making lens small is mostly based on using symmetrical design instead of retrofocus/telecentric design, and when focal length is short the symmetrical lens has to be very close to sensor => the light hits sensor in very high angles.

Due to this Leica had to generate new versions from most of their lenses even their sensor cover glass is...Show more →

Hi Samuli,

Thank you for your input. I have still not given up on this lens. I presume that a Kolari UT sensor stack camera will perform even better with this lens than even my V3 thin sensor cover. I believe that the result of this would be a sensor stack thickness of about .7mm while my thin sensor stack should be 1.3mm which is still much better than the 2.5mm Sony sensor stack.

I did some experimenting with the lens and LR6.14 and have found that the lens works well with the profile for the Zeiss 28mm f2.8 Biogon ZM lens. As a result, I have applied the profile to the lens for the f8 and f11 tests for all 3 cameras. The profile does clean up a lot of the issues observed making for a much better starting point from which I would perform my processing of images. Also, I have noted that the lower right corner of the images are suffering from what I believe is a dip in the ground surface making this near impossible to maintain sharpness unless an even smaller aperture was used.

I will present the results for each of the 3 cameras in this and following 5 postings. For each of the cameras, I will post the images as above as described and compared with the same image with the same adjustments with the addition of applying the LR6.14 profile for the Zeiss 28mm f2.8 Biogon ZM. After that, I will present the corners of both versions compared at 100% for the lower left and the lower right corners.

Again, I will begin with the Kolari modded A7r.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s; Zeiss Biogon Profile

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s; Zeiss Biogon Profile, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s, Lower Right Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f8, 1/50s; Zeiss Biogon Profile, Lower Right Corner 100%

Edited on Jan 02, 2019 at 09:31 PM · View previous versions

Dec 30, 2018 at 05:08 AM

naturephoto1
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p.1 #13 · p.1 #13 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

This posting is for the lens with my A7r V3 Kolari thin sensor modded camera with the lens at f11.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s; Zeiss Biogon Profile

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s; Zeiss Biogon Profile, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s, Lower Right Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, A7r V3; ISO 100, f11, 1/30s; Zeiss Biogon Profile, Lower Right Corner 100%

Dec 30, 2018 at 05:34 AM

naturephoto1
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p.1 #14 · p.1 #14 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

This posting is for the lens mounted on my stock A7r camera with the lens set to f8.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s; Zeiss Biogon Profile

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s; Zeiss Biogon Profile, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s, Lower Right Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f8, 1/100s; Zeiss Biogon Profile, Lower Right Corner 100%

Dec 30, 2018 at 05:54 AM

naturephoto1
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p.1 #15 · p.1 #15 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

This posting is for the lens mounted on my stock A7r camera with the lens set to f11.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f11, 1/80s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f11, 1/80s; Zeiss Biogon Profile

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f11, 1/80s, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stockA7r; ISO 100, f11, 1/80s; Zeiss Biogon Profile, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f11, 1/80s, Lower Right Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7r; ISO 100, f11, 1/80s; Zeiss Biogon Profile, Lower Right Corner 100%

Dec 30, 2018 at 06:16 AM

naturephoto1
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p.1 #16 · p.1 #16 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

This posting is for the lens mounted on my stock A7rIII camera with the lens set to f8.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f8, 1/8s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7IIIi; ISO 100, f8, 1/8s; Zeiss Biogon Profile

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f8, 1/8s, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f8, 1/8s; Zeiss Biogon Profile, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f8, 1/8s, Lower Right Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f8, 1/8s; Zeiss Biogon Profile, Lower Right Corner 100%

Dec 30, 2018 at 06:50 AM

naturephoto1
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p.1 #17 · p.1 #17 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

This posting is for the lens mounted on my stock A7rIII camera with the lens set to f11.

Rich

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f11, 1/5s

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f11, 1/5s; Zeiss Biogon Profile

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f11, 1/5s, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stockA7rIII; ISO 100, f11, 1/5s; Zeiss Biogon Profile, Lower Left Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f11, 1/5s, Lower Right Corner 100%

Minolta 28mm f2.8 M-Rokkor, Novoflex adapter, stock A7rIII; ISO 100, f11, 1/5s; Zeiss Biogon Profile, Lower Right Corner 100%

Dec 30, 2018 at 07:09 AM

Samuli Vahonen
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p.1 #18 · p.1 #18 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

naturephoto1 wrote:
I have still not given up on this lens. I presume that a Kolari UT sensor stack camera will perform even better with this lens than even my V3 thin sensor cover. I believe that the result of this would be a sensor stack thickness of about .7mm while my thin sensor stack should be 1.3mm which is still much better than the 2.5mm Sony sensor stack.
Oh sorry, I somehow assumed/remembered you have UT... If this was v3 then yes there is change it will be OKish with UT.

naturephoto1 wrote:
Also, I have noted that the lower right corner of the images are suffering from what I believe is a dip in the ground surface making this near impossible to maintain sharpness unless an even smaller aperture was used.
28mm f/8 DOF should cover, it's possible to have some asymmetry in lens, worth doing test to check asymmetry of the lens.

Samuli

Dec 30, 2018 at 08:19 AM

naturephoto1
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p.1 #19 · p.1 #19 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

Samuli Vahonen wrote:
Oh sorry, I somehow assumed/remembered you have UT... If this was v3 then yes there is change it will be OKish with UT.

28mm f/8 DOF should cover, it's possible to have some asymmetry in lens, worth doing test to check asymmetry of the lens.

Samuli

Hi Samuli,

Thank you again for the additional input. Unfortunately when I had Kolari work on my A7r camera they had just come out with the V3 in January of 2016 which had the same .8mm sensor cover thickness as the V2 sensor cover. The UT sensor cover came out later. I am not sure if I want to spend another $400 to have Kolari replace the V3 sensor cover with the UT sensor cover. Maybe a talk with Ilija to see if he could offer a better price. That is something to consider.

I am going to try a few more options including instead of focusing about 1/2 of the way into the image as I have been doing to try to focus about 1/3 of the way into the image, which I would often try to do if I were trying to rely on the Hyperfocal of the lens. One additional idea is to try to focus close to one of the corners (but not all the way into the corner. I will see when I am able to get out and run additional tests, but hopefully one of these options will work. I believe that at least when I do not need or want to hold focus to infinity, f8 or f11 may work with the lens.

Rucg

Dec 30, 2018 at 10:51 AM

realVivek
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p.1 #20 · p.1 #20 · Minolta 28mm f2.8 M-Rokkor lens on A7r series cameras

I would be interested to see how the M Rokkors fare on a stock Z7.

Dec 31, 2018 at 07:48 AM

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