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Serious issues with the Techart GFX adapter
  
 
engardeknave
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p.1 #1 · p.1 #1 · Serious issues with the Techart GFX adapter


There are many, many serious issues that are not being addressed by public reviews of this adapter. I think these issues deserve their own thread to warn people.

Right now, this product is at a proof of concept level of development. Do not purchase this for professional use. It is incredibly flaky. It freezes the camera constantly. It spins the AF motor of every lens back and forth every time you turn on the camera. (Even with a 400mm lens, which takes forever.) It completely freezes with the Tamron 35mm SP DI VC (and probably all Tamrons).

The EXIF info focal length is always 63mm, regardless of actual lens or focal length. If you're shooting with a zoom, you will not be able to tell what the focal length of the shot is after the fact.

None of those things are deal-breakers for me. Here it gets much worse:

The Techart emulates the GF 63mm with EVERY LENS, which causes the camera to treat every lens like the GF 63mm.

Every AF lens you attach will focus incorrectly at small apertures. Since the camera thinks the lens is the GF 63mm, it applies focus shift compensation when you press the shutter or DOF preview button. You can see the focus move on your adapted lens when you press the button, exactly as it does with the GF 63mm. Good luck if you create photos that involve many manual stacked shots where all pixels must be perfectly aligned between frames.

All photos taken with this adapter have the lens profile of the GF 63mm automatically applied. This means that the distortion & vignette correction of the GF 63mm will be applied to every lens, effectively warping your photos. This cannot be disabled in LR or ACR, as far as I can tell.






Edited on Nov 30, 2017 at 01:58 PM · View previous versions



Nov 29, 2017 at 06:13 PM
engardeknave
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p.1 #2 · p.1 #2 · Serious issues with the Techart GFX adapter


This would be a great place to mention other issues, as well as any workarounds or solutions.


Nov 29, 2017 at 06:16 PM
mehrdad sadat
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p.1 #3 · p.1 #3 · Serious issues with the Techart GFX adapter


so what are your plans, i am on the second of these, the first did not work at all, the second one works. i do agree with your statements, this is a POC. there is another one of these adaptors out there and there were also problems with that one also on this forum. when i contacted techart about my problem, they very responsive but the process was slow due to distance. i think u and i both knew this was a poc before we bought it. this is cutting edge at the edge. just be patient and use it with in the limitation and dont push it




Nov 29, 2017 at 10:08 PM
engardeknave
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p.1 #4 · p.1 #4 · Serious issues with the Techart GFX adapter


I expected the first couple of issues, but I would not have bought this knowing that it emulates the GF 63mm and is subject to the same focus shift compensation and forces the application of the wrong lens profile. That is just beyond the pale. This makes the adapter effectively unusable to me without disconnecting the electronics (twisting it partially off).

My strategy is to complain until they fix it with a firmware update. Depending on how angry I am later, I may make a video about what a piece shit this thing is and post it everywhere.



Nov 29, 2017 at 10:55 PM
Edward Castro
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p.1 #5 · p.1 #5 · Serious issues with the Techart GFX adapter


If you do, please post it on Fujirumors since it will get lots of exposure. Sorry to hear about the issues you are having.


Nov 30, 2017 at 12:45 AM
mehrdad sadat
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p.1 #6 · p.1 #6 · Serious issues with the Techart GFX adapter


i think they should fix it.,


Nov 30, 2017 at 01:25 AM
engardeknave
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p.1 #7 · p.1 #7 · Serious issues with the Techart GFX adapter


I have added a demonstration of the lens profile issue to the OP.


Nov 30, 2017 at 01:37 AM
engardeknave
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p.1 #8 · p.1 #8 · Serious issues with the Techart GFX adapter


And suddenly...

https://www.facebook.com/techartadapter/posts/901471696687960



Nov 30, 2017 at 02:17 AM
rdeloe
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p.1 #9 · p.1 #9 · Serious issues with the Techart GFX adapter


If that was due to you, then way to go! You have the Power.

engardeknave wrote:
And suddenly...

https://www.facebook.com/techartadapter/posts/901471696687960





Nov 30, 2017 at 02:28 AM
engardeknave
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p.1 #10 · p.1 #10 · Serious issues with the Techart GFX adapter


I gave them a rambling one-star review wherein I specifically mentioned Tamron lenses, which I don't really care about at all. But at least they are working on the proper lens identification.


Nov 30, 2017 at 02:47 AM
 

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engardeknave
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p.1 #11 · p.1 #11 · Serious issues with the Techart GFX adapter


I just talked to Techart. I definitely got their attention.

One correction: they will allow return of the adapter. (Even if they didn't before, they will now, especially if you mention the lens profile issue.)

They are actively working on the lens profile issue and it's their first priority. That said, they have no solution to the issue yet. Given how hard reverse engineering is, that solution may no come for a very long time.



Nov 30, 2017 at 02:10 PM
molson
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p.1 #12 · p.1 #12 · Serious issues with the Techart GFX adapter


engardeknave wrote:
I just talked to Techart. I definitely got their attention.

One correction: they will allow return of the adapter. (Even if they didn't before, they will now, especially if you mention the lens profile issue.)

They are actively working on the lens profile issue and it's their first priority. That said, they have no solution to the issue yet. Given how hard reverse engineering is, that solution may no come for a very long time.



In the Jonas Rask review, he stated (or at least implied) when responding to comments, that the adapter he tested was updated to newer firmware to correct these issues. Sounds like this was bogus?



Nov 30, 2017 at 03:09 PM
engardeknave
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p.1 #13 · p.1 #13 · Serious issues with the Techart GFX adapter


molson wrote:
In the Jonas Rask review, he stated (or at least implied) when responding to comments, that the adapter he tested was updated to newer firmware to correct these issues. Sounds like this was bogus?


Right after I made a bunch of posts in various places with the above demonstration they posted on Facebook that a new firmware to resolve these issues is forthcoming. This was last night. The person I spoke with this morning seemed very concerned and understood the seriousness of the issue. However, he flat out told me they don't have a solution and might not have a one for a while. So I think it's just damage control.



Nov 30, 2017 at 04:04 PM
engardeknave
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p.1 #14 · p.1 #14 · Serious issues with the Techart GFX adapter


Geometric Distortion Params : 645 0.3535648995 0.5001828154 0.6124314442 0.7071297989 0.7904936015 0.866179159 0.9352833638 1 -0.3517456055 -0.7227783203 -1.08416748 -1.455200195 -1.82623291 -2.208496094 -2.579528809 -2.950561523
Chromatic Aberration Params : 645 0.3535648995 0.5001828154 0.6124314442 0.7071297989 0.7904936015 0.866179159 0.9352833638 1 9.155273438e-005 9.155273438e-005 9.155273438e-005 0.0001220703125 0.0001220703125 0.0001220703125 0.000122070
3125 0.0001220703125 6.103515625e-005 6.103515625e-005 6.103515625e-005 6.103515625e-005 3.051757813e-005 3.051757813e-005 3.051757813e-005 6.103515625e-005
Vignetting Params : 645 0.3535648995 0.5001828154 0.6124314442 0.7071297989 0.7904936015 0.866179159 0.9352833638 1 98.46142578 97.29199219 96.10498047 94.90234375 93.72949219 92.58544922 91.38769531 90.22021484


I found these with Exiftool. Unfortunately Exiftool cannot remove them yet. No idea if these are the tags that contain the lens profile information for the GR 63mm, but they sure look like it.

People are saying that if you convert to DNG first and remove the tags Opcode1, Opcode2, Opcode3, this will remove the lens profile correction. Not sure about that, but that is not an acceptable workflow for me anyway.



Nov 30, 2017 at 04:04 PM
engardeknave
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p.1 #15 · p.1 #15 · Serious issues with the Techart GFX adapter


As I mentioned, one workaround is to use Adobe DNG Converter and then Exif Tool on the DNGs to remove the offending lens profile. The following command parameters will remove the profile:

exiftool.exe *.dng -OpcodeList3= -OpcodeList2= -overwrite_original

https://www.sno.phy.queensu.ca/~phil/exiftool/



Dec 01, 2017 at 09:15 PM
highdesertmesa
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p.1 #16 · p.1 #16 · Serious issues with the Techart GFX adapter


They ignored three requests for support from me and only responded after reading my posts in the Facebook group or elsewhere. I shipped my adapter back to them USPS Priority Mail weeks ago, and they still have not received it. Even if someone were to buy another adapter from China, the risk of having to send it back for replacement and the wait times involved for a return trip are not worth it. If these were $100 adapters, I would have just thrown it in the trash, written a bad review and moved on with my life.


Dec 07, 2017 at 08:42 PM
highdesertmesa
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p.1 #17 · p.1 #17 · Serious issues with the Techart GFX adapter


And I didn't even consider how it reporting it was a 63mm would cause the GF 63 corrections to be applied to every lens. How could they possibly think that would be even remotely acceptable?

The well-known photographer(s) who has given a positive review of this adapter should consider retracting, correcting, or removing their article.



Dec 07, 2017 at 08:46 PM
engardeknave
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p.1 #18 · p.1 #18 · Serious issues with the Techart GFX adapter


They likely started manufacturing the hardware while they were still working on reverse engineering the Fuji lens protocol. They thought they'd have it done by now, but obviously that has not been the case.

Today I received the Steelsring adapter. Hilariously, while they managed to resolve the lens profile issue, its problems are even worse and will never be resolved with a firmware update.



Dec 07, 2017 at 11:15 PM
engardeknave
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p.1 #19 · p.1 #19 · Serious issues with the Techart GFX adapter


Plot twist: Techart tells me they have resolved the lens profile issue. I think they likely put a zero-correction lens profile in the metadata, which is what I believe the Steelsring does.


Dec 08, 2017 at 01:14 AM
highdesertmesa
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p.1 #20 · p.1 #20 · Serious issues with the Techart GFX adapter


engardeknave wrote:
...Today I received the Steelsring adapter. Hilariously, while they managed to resolve the lens profile issue, its problems are even worse and will never be resolved with a firmware update.


Dang, man. Sorry to hear that. I'm sticking with GF for GFX and my replacement 5DsR (for the one I sold because the Techart was coming) will be for EF lenses. Safe and easy.



Dec 08, 2017 at 03:16 AM
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