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Archive 2015 · Kolari Mod's Improvements: A Summary of Tests
  
 
Fred Miranda
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p.14 #1 · p.14 #1 · Kolari Mod's Improvements: A Summary of Tests


The best choice may be making your own color profiles with X-Rite Passport for several Kolari pre-sets (Daylight, Tungsten, Cloudy, etc.). It's very easy and takes only a few minutes.


Sep 14, 2016 at 10:33 PM
DavidBM
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p.14 #2 · p.14 #2 · Kolari Mod's Improvements: A Summary of Tests


Fred Miranda wrote:
The best choice may be making your own color profiles with X-Rite Passport for several Kolari pre-sets (Daylight, Tungsten, Cloudy, etc.). It's very easy and takes only a few minutes.


+1 on the color checker.
It's a small investment that can not only fix the Kolari issue, but makes life easier in countless ways

-never worry about the colour balance of lenses again. There are too many factors to consider in lens choice without worrying about colour. Profile them, and all your images will begin processing with a common start point

-profile for the light at any places you regularly shoot that might (walls, trees, LED domestic lights ) have odd colour.

-if you shoot in museums take a shot of the colour checker in front of your favourite pieces, profile, and find what that painting *really* looks like

-generate daylight/tungsten/ cloudy profiles that are correct for your camera (not that there's huge variance between cameras of the same model, but there is some) and, more significantly, the typical light where you shoot.



Sep 14, 2016 at 11:26 PM
artur5
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p.14 #3 · p.14 #3 · Kolari Mod's Improvements: A Summary of Tests


Having owned the Color Checker Passport for several years, I've made profiles for different brands of cameras with uneven results. It didn't work very well for a couple of Ricoh GXR modules. Preset profiles were much more accurate. On a Fuji XQ1 (Trans sensor) it wasn't bad but the saturation was excessive for my taste. The best results have been with several E-mount Sonys.
Anyway, my main gripe with those profiles is that they work only with Adobe soft (LR or Camera Raw). Capture One and other programs won't accept *.dcp files as valid profiles.



Sep 15, 2016 at 08:20 AM
uscmatt99
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p.14 #4 · p.14 #4 · Kolari Mod's Improvements: A Summary of Tests


Thanks for the advice guys. I just ordered the Passport, seems pretty easy to use, should have tried this earlier. I figured out which folder to place the supplied Kolari profile and how to select and apply it to some of the test shots I did yesterday in the meantime.

I started off focusing all lenses tested at infinity centrally, tilted to get foliage at the corners of all shots. I compared a ZM 25/2.8 to a ZF 25/2.8, and a ZM 35/2.8 to a ZF.2 35/1.4. Both ZM lenses have curvature towards the camera in the center, and away at the periphery (inward per Fred). The ZF35 has opposite outward curvature by this nomenclature. I'm not familiar enough with the ZF25 field curvature at infinity to comment.

The ZM25 must have a more favorable exit pupil distance to center compared to the ZM35. Either that an/or the degree of field curvature is more pronounced on the ZM35, which I suspect.

The ZM25 is usable at f/5.6 and peaks at f/8 with diffraction softening at f/11. Centrally the ZM25 is amazing even at f/4.

The ZM35 is usable at f/8 but needs f/11 to be sharp to the corners. But it still doesn't reach the level of sharpness the ZM25 can. The good news is that when I took a photo at f/8 with the focus point in the corner of the frame, excellent sharpness was achieved, on par with the ZM25.

In summary, both lenses are usable with excellent results (within limitations) that I'm sure will be on par with or better than my FE16-35/4 if focused optimally, probably mid-frame or near the edge. I plan to use the soon to arrive Voigtlander helicoid adapter with these RF lenses on the A7M, and optimize infinity so I can shoot around f/5.6-8.0. I've really missed hard-stop infinity since parting with my Ricoh GXR, glad to get it back. I'm really excited to take these for a spin in a couple of weeks when my wife and I travel to Spain. I'll be getting to know another new lens by the way, ZM Sonnar 50/1.5 in the house!



Sep 15, 2016 at 02:42 PM
HaruhikoT
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p.14 #5 · p.14 #5 · Kolari Mod's Improvements: A Summary of Tests


Hi folks,

While Kolari mod is great solution for wide-angle rangefinder lens users,
personally I still hesitate to modify my A7 because such unofficial mod voids warranty.
Today I would like to introduce another solution to fix corner smearing issue.

I believe Astigmatism is the principal cause of corner smearing.
I tried some optical simulations and found that a plano-convex lens placed in front of the WA RF lens can control astigmatism.
I use OSLO free edition:
http://www.lambdares.com/oslo-university-program

For simplicity, simulation use perfect lens instead of complicated actual lens design.
I think symmetrical lens design such as Biogon matches this simplified simulation, but retrofocus design does not.
Here are the results.

Astigmatism at Extreme Corner:
21mm lens with 1.8mm thick cover glass (Original A7): 0.6mm.
21mm lens with 0.8mm thick cover glass (Kolari/Leica): 0.25mm.
1.5m plano-convex in front of 21mm with 1.8mm cover glass: 0.14mm.

28mm lens with 1.8mm thick cover glass (Original A7): 0.4mm.
28mm lens with 0.8mm thick cover glass (Kolari/Leica): 0.18mm.
2m plano-convex in front of 28mm with 1.8mm cover glass: 0.07mm.

So theoretically, plano-convex method outperforms Kolari/Leica in terms of astigmatism!


Edited on Oct 04, 2016 at 02:50 PM · View previous versions



Oct 03, 2016 at 11:20 AM
HaruhikoT
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p.14 #6 · p.14 #6 · Kolari Mod's Improvements: A Summary of Tests


To prove the theory, I purchased a f=1.5m lens "SLB-50-1500PM" and a f=2m lens "SLB-50-2000PM" from Japanese lens supplier SIGMA-KOKI.
Both are 3mm thick, 50mm diameter and AR-coated. $85-$90 each.
You can order here:
http://www.global-optosigma.com/en_jp/Catalogs/pno/?from=page&pnoname=SLB-P%28%CF%8630%EF%BD%9E%CF%8650%29&ccode=W3043&dcode=W3043-2

I show examples of modification. Easy and non-destructive.

Contax G Biogon 21mm:
Attach 55-52mm stepdown adapter, put the 1.5m lens into the 52mm thread and clamp it with 52mm ring.
I got the 52mm ring by disassembling this:
https://www.amazon.com/AmazonBasics-UV-Protection-Lens-Filter/dp/B00XNMWCF8

https://farm6.staticflickr.com/5116/29459308813_7d3abb7516_o_d.jpg


Contax G Biogon 28mm:
Attach 46-55mm stepup, 55-52mm stepdown, put the 2m lens into the 52mm thread and clamp it with 52-55mm stepup adapter.

https://farm6.staticflickr.com/5529/29459307793_0999bb916e_o_d.jpg

https://farm9.staticflickr.com/8560/29459306733_8c25b0d1a7_o_d.jpg




Oct 03, 2016 at 11:22 AM
HaruhikoT
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p.14 #7 · p.14 #7 · Kolari Mod's Improvements: A Summary of Tests


Here are test images taken by original (no kolari mod) A7.
Manually focused at the center of truss bridge.
Processed by Rawtherapee from ARW file.
Flat field calibration is applied to fix color cast and vignetting.
No noise reduction, No sharpening.

Shots at wide-open:
2.8/21 original
https://farm6.staticflickr.com/5674/29972420812_bb3934a080_z_d.jpg


2.8/21 modified
https://farm9.staticflickr.com/8133/29459303263_3afebb095c_z_d.jpg


2.8/21 original: upper-left corner 100% crop
https://farm9.staticflickr.com/8679/29459299873_93ea5119c5_o_d.jpg


2.8/21 modified: upper-left corner 100% crop
https://farm9.staticflickr.com/8582/29459298773_a959a322b9_o_d.jpg


2.8/28 original
https://farm6.staticflickr.com/5270/29459282873_635ceb2167_z_d.jpg


2.8/28 modified
https://farm6.staticflickr.com/5015/29459281173_2acdef84e8_z_d.jpg


2.8/28 original: lower-right corner 100% crop
https://farm6.staticflickr.com/5029/29459279533_dcc5738716_o_d.jpg


2.8/28 modified: lower-right corner 100% crop
https://farm9.staticflickr.com/8394/29459278223_0705224a3c_o_d.jpg


I also uploaded stopping-down results (f4/5.6/8/11).
https://www.flickr.com/gp/147672914@N02/SkM924

In my eyes, 21mm's results look better than Kolari:
http://www.fredmiranda.com/forum/topic/1340474/33#12925484



Oct 03, 2016 at 11:25 AM
HaruhikoT
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p.14 #8 · p.14 #8 · Kolari Mod's Improvements: A Summary of Tests


One more thing, for those who have Kolari/Leica body.
Simulation shows that combination of thin cover glass and plano-convex method would get even better result!

Astigmatism at Extreme Corner:
3m plano-convex "SLB-50-3000PM" in front of 21mm with 0.8mm cover glass: 0.11mm.

Edited on Oct 04, 2016 at 02:50 PM · View previous versions



Oct 03, 2016 at 11:27 AM
Olaf G
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p.14 #9 · p.14 #9 · Kolari Mod's Improvements: A Summary of Tests


^Thank you for posting this.

Actually I have a similar experience.
When I use a curved ghostless filter with the glass flipped (so it is concave) on my Pentax-M 20mm f4 it significantly improves the borders on my unmodified A7.

Edited on Oct 03, 2016 at 03:44 PM · View previous versions



Oct 03, 2016 at 11:33 AM
mdemeyer
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p.14 #10 · p.14 #10 · Kolari Mod's Improvements: A Summary of Tests


Great exploratory work! What is the primary lens attribute that determines the optimal Plano-convex filter choice?

Michael



Oct 03, 2016 at 03:04 PM
 

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Nanh
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p.14 #11 · p.14 #11 · Kolari Mod's Improvements: A Summary of Tests


HaruhikoT wrote:

Here are test images taken by original (no kolari mod) A7.
Manually focused at the center of truss bridge.
Processed by Rawtherapee from ARW file.
Flat field calibration is applied to fix color cast and vignetting.
No noise reduction, No sharpening.

Shots at wide-open:
2.8/21 original
https://farm6.staticflickr.com/5674/29972420812_bb3934a080_z_d.jpg


2.8/21 modified
https://farm9.staticflickr.com/8133/29459303263_3afebb095c_z_d.jpg


2.8/21 original: upper-left corner 100% crop
https://farm9.staticflickr.com/8679/29459299873_93ea5119c5_o_d.jpg


2.8/21 modified: upper-left corner 100% crop
https://farm9.staticflickr.com/8582/29459298773_a959a322b9_o_d.jpg


2.8/28 original
https://farm6.staticflickr.com/5270/29459282873_635ceb2167_z_d.jpg


2.8/28 modified
https://farm6.staticflickr.com/5015/29459281173_2acdef84e8_z_d.jpg


2.8/28 original: lower-right corner 100% crop
https://farm6.staticflickr.com/5029/29459279533_dcc5738716_o_d.jpg


2.8/28 modified: lower-right corner 100% crop
https://farm9.staticflickr.com/8394/29459278223_0705224a3c_o_d.jpg


I also uploaded stopping-down results (f4/5.6/8/11).
https://www.flickr.com/gp/147672914@N02/SkM924

In my eyes, 21mm's results look better than Kolari:
http://www.fredmiranda.com/forum/topic/1340474/33#12925484


Wow, this is excellent. So simple yet so effective! Very eager to try it out even though I have a Kolari modded A7. If it works it would mean I don't have to mod all future A7s I might purchase. Few questions:

How do you know which glass type to choose for different lenses and cover glass thickness? By trying? Is it possible to figure out what's the approximate best glass type to use for ZM 35mm 1.4 even though it's not a perfect symmetric design?

I noticed in the simulation you have placed the Kolari modded cover glass at the same plane as the original cover glass. I.e. the reduced thickness is between the glass and the sensor. Would the result be different if the cover glass is placed at a constant distance to the sensor, and the point where light first touches the cover glass is shifted back by the reduced amount?

Are there any other effects generated by the filter glass? Distortion? CA? Focal length changes?

Would the 50mm filter glass fit in arbitrary 52mm filter rings? Any special techniques to fix the glass? Does the 55 to 52mm step down ring + 52mm filter setup induce any mechanical vignetting on the Contax G 21?



Oct 03, 2016 at 04:03 PM
hiepphotog
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p.14 #12 · p.14 #12 · Kolari Mod's Improvements: A Summary of Tests


HaruhikoT wrote:

One more thing, for those who have Kolari/Leica body.
Simulation shows that combination of thin cover glass and plano-convex method would get even better result!

Astigmatism at Extreme Corner:
3m plano-convex "SLB-50-3000PM" in front of 21mm with 0.8mm cover glass: 0.11mm.
https://farm8.staticflickr.com/7538/29792036410_fdeb1069aa_o_d.jpg


Oh wow, exciting news! I did notice some contrast degradation in the center with mod sample vs. the unmodded one. But the overall picture is impressive, given that even after the Kolari mod, the Biogon 21 is still not usable at WO. I bet the optimal thickness and curvature would depend on the focal length and exit pupil of each lens then.



Oct 03, 2016 at 04:46 PM
hiepphotog
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p.14 #13 · p.14 #13 · Kolari Mod's Improvements: A Summary of Tests


HaruhikoT wrote:

One more thing, for those who have Kolari/Leica body.
Simulation shows that combination of thin cover glass and plano-convex method would get even better result!

Astigmatism at Extreme Corner:
3m plano-convex "SLB-50-3000PM" in front of 21mm with 0.8mm cover glass: 0.11mm.
https://farm8.staticflickr.com/7538/29792036410_fdeb1069aa_o_d.jpg


In practice, how big of a difference between 0.11mm vs. 0.14mm? I don't imagine that much.



Oct 03, 2016 at 04:53 PM
Fred Miranda
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p.14 #14 · p.14 #14 · Kolari Mod's Improvements: A Summary of Tests


HaruhikoT wrote:
Here are test images taken by original (no kolari mod) A7.
Manually focused at the center of truss bridge.
Processed by Rawtherapee from ARW file.
Flat field calibration is applied to fix color cast and vignetting.
No noise reduction, No sharpening.


Thank you for this info. I have always wondered about this and even asked a few adapter manufactures (Metabones, etc.) if it would be possible to make a corrective glass adapter M to E-Mount. I never got an answer but perhaps the main issue is that lenses would perform differently depending on their optical design.



Oct 03, 2016 at 05:11 PM
hiepphotog
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p.14 #15 · p.14 #15 · Kolari Mod's Improvements: A Summary of Tests


Fred Miranda wrote:
Thank you for this info. I have always wondered about this and even asked a few adapter manufactures (Metabones, etc.) if it would be possible to make a corrective glass adapter M to E-Mount. I never got an answer but perhaps the main issue is that lenses would perform differently depending on their optical design.


I think there is hardly room in the back, but a front end solution is very nice. I agree with you that it would be lens dependent. However, seeing the drastic improvement from just using a generic ray tracing simulation, the current result might not be 100% optimal, but it is certainly more than good enough. I have shot with that G 21 extensively on my Kolari mod A7s, I know it's among the worst offenders out there. Time to do some ray tracing .



Oct 03, 2016 at 05:24 PM
nehemiahphoto
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p.14 #16 · p.14 #16 · Kolari Mod's Improvements: A Summary of Tests


Crazy and awesome...I was eyeing the G21 and eagerly watching the Kolari mod thread as it unfolded. Hiep tested the N85 on an unmodded A7 and noticed corner improvement due to the sensor stack being modded.

Couple questions for you guys (if you know):

1) If you're using the G21 with a techart adapter, will AF (the lens fluctuating in distance from the senor) hurt IQ?

I am guess not

2) I can't tell tell how good the IQ on the Biogon 21...with the P-C (plano convex) mod, is it excellent? If this works like I am think, I may very well have to order one and run a test against my FE 16-35

3) Can we expect better performance with the a7rII than the a7 or a7r?

Again, stupendous find and thank you so much for sharing with us.


Edited on Oct 03, 2016 at 10:43 PM · View previous versions



Oct 03, 2016 at 09:52 PM
Fred Miranda
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p.14 #17 · p.14 #17 · Kolari Mod's Improvements: A Summary of Tests


Nanh wrote:
Wow, this is excellent. So simple yet so effective! Very eager to try it out even though I have a Kolari modded A7. If it works it would mean I don't have to mod all future A7s I might purchase. Few questions:

How do you know which glass type to choose for different lenses and cover glass thickness? By trying? Is it possible to figure out what's the approximate best glass type to use for ZM 35mm 1.4 even though it's not a perfect symmetric design?

I noticed in the simulation you have placed the Kolari modded cover glass at the same
...Show more

I would love to hear about a 'filter' solution for the ZM 35/1.4!



Oct 03, 2016 at 09:59 PM
Fred Miranda
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p.14 #18 · p.14 #18 · Kolari Mod's Improvements: A Summary of Tests


hiepphotog wrote:
I think there is hardly room in the back, but a front end solution is very nice. I agree with you that it would be lens dependent. However, seeing the drastic improvement from just using a generic ray tracing simulation, the current result might not be 100% optimal, but it is certainly more than good enough. I have shot with that G 21 extensively on my Kolari mod A7s, I know it's among the worst offenders out there. Time to do some ray tracing .


Yes, perhaps we can get a one solution that's good enough for most lenses. However, it only seems to be a solution for astigmatism.
How about induced field curvature from the Sony sensor stack?



Oct 03, 2016 at 10:01 PM
uhoh7
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p.14 #19 · p.14 #19 · Kolari Mod's Improvements: A Summary of Tests


Yes it's hard to believe the corrective lens is going to handle all the various things which are happening, but results are results and if you can actually get as good or better than the kolari it's really something. I'd need to see more before I would be convinced.

When you think about it, just a few would be plenty to get a UWA, 28ish and 35 M, LTM or contax G troika. I think many would pay 100USD for a preselected configuration to get the best from a small choice wide.

Having delt with Sony warranty I'm not sure it's worth worrying about that nightmare, and a year comes pretty fast anyway. But that's just me, I know many are reluctant to have their sensor modified.


Keyhole by unoh7, 28 Cron, A7 Kolari v2 around f/8

I'd love to have a little correction filter to put on the CV 21/4 for the M9!



Oct 03, 2016 at 11:47 PM
mdemeyer
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p.14 #20 · p.14 #20 · Kolari Mod's Improvements: A Summary of Tests


uhoh7 wrote:
I'd love to have a little correction filter to put on the CV 21/4 for the M9!


Yeah... this should help on Leica bodies, as well. :-)

Michael



Oct 04, 2016 at 12:11 AM
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