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Techart PRO FAQ
  
 
genji
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p.19 #1 · p.19 #1 · Techart PRO FAQ


DavidBM wrote:
I'm guessing the issue is that the Tele Tessar 4/85 is a stop slower, so the AF on TAP is less good, with the result that the lens has to be closer to being in focus for the AF to work. Nothing to do with the focus throw.


This makes sense. I guess the only way to be sure is to run some tests. Just as well I have more 85mm lenses than I know what to do with.



Mar 13, 2017 at 03:54 AM
Fred Miranda
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p.19 #2 · p.19 #2 · Techart PRO FAQ


It's no secret that I'm a big fan of the TechArt Pro adapter.
However, as others have reported on this and other threads, there is design flaw that needs to be addressed by TechArt.

The issue is how the 'lens carrier' (the section that moves in and out) was designed. It will develop a wobble after a while because its top area it's not supported at all!
The heavier the lens, the faster it will wobble but it's an issue even if only using light lenses.

Point in case: I have tried three brand new adapters and used them solely with two lenses: Zeiss 50/1.5C and Zeiss 35/1.4. The latter is only about 380g. Within a month of usage, the wobble started to happen in all three adapters.

It's easy to test yours: Just make the adapter extend and press the top of the 'lens carrier'. If it moves inwards as you press it, your adapter has the wobble.

Is this really a problem?
Yes, it is. This wobble acts like a lens decentering because of the lack of parallelism and will make your corners look asymmetric. It will also affect the adapter's ability to focus with accuracy and speed.

It's a hardware issue and I hope Techart addresses it for a next version of this adapter.



Mar 23, 2017 at 04:52 PM
rji2goleez
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p.19 #3 · p.19 #3 · Techart PRO FAQ


Yes, I've noticed some wobble depending on whether the adapter is extended or not. At first I though it was intermittent but it's as you describe. Mine is currently very slight but worrisome.


Mar 23, 2017 at 04:59 PM
Fred Miranda
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p.19 #4 · p.19 #4 · Techart PRO FAQ


rji2goleez wrote:
Yes, I've noticed some wobble depending on whether the adapter is extended or not. At first I though it was intermittent but it's as you describe. Mine is currently very slight but worrisome.


Even the slightest amount of movement (wobble) is enough to throw your corners out of focus. It acts as a lens tilt.
Unfortunately it will get worse over time.

I made TechArt aware of this but as of now, I still haven't received a response.



Mar 23, 2017 at 05:02 PM
rji2goleez
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p.19 #5 · p.19 #5 · Techart PRO FAQ



I contacted them at one point about the wobble and they wanted me to send a video to show the wobble. Well then my adapter wasn't wobbling which is probably just wether it was extended or not.

I suggest we all check our adapters and contact Techart if we find as Fred has.


Fred Miranda wrote:
Even the slightest amount of movement (wobble) is enough to throw your corners out of focus. It acts as a lens tilt.
Unfortunately it will get worse over time.

I made TechArt aware of this but as of now, I still haven't received a response.




Mar 23, 2017 at 05:13 PM
Fred Miranda
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p.19 #6 · p.19 #6 · Techart PRO FAQ


rji2goleez wrote:
I contacted them at one point about the wobble and they wanted me to send a video to show the wobble. Well then my adapter wasn't wobbling which is probably just wether it was extended or not.

I suggest we all check our adapters and contact Techart if we find as Fred has.



My last adapter was a replacement from TechArt. I also had to send a video showing the wobble and they replaced it with a new unit. Unfortunately this new unit started to have the same exact issue a few weeks later...



Mar 23, 2017 at 05:17 PM
mortyb
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p.19 #7 · p.19 #7 · Techart PRO FAQ


Wobble here as well. As I shoot "wide-open" most of the time with blurry backgrounds, it's not critical to me the way I use the adapter now. But I consider it to be a serious design flaw, especially considering the price.


Mar 23, 2017 at 05:29 PM
 

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bluloo
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p.19 #8 · p.19 #8 · Techart PRO FAQ


Can anyone link to a video of the wobble?

I can extend the adapter with a 90mm Summicron, push lightly, downward, on the top end of the lens, and have the bottom side of adapter rotate inward (lens deflects downward) - is that what people are referring to?




Mar 23, 2017 at 05:58 PM
rji2goleez
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p.19 #9 · p.19 #9 · Techart PRO FAQ




bluloo wrote:
Can anyone link to a video of the wobble?

I can extend the adapter with a 90mm Summicron, push lightly, downward, on the top end of the lens, and have the bottom side of adapter rotate inward (lens deflects downward) - is that what people are referring to?



On mine, it's less of a bending and more of a looseness if that makes sense to folks. In other words, it feels like the adapter has a wear gap that makes it feel like it has loosened so that it can 'bump' from side to side or top to bottom.



Mar 23, 2017 at 06:02 PM
ratherfish
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p.19 #10 · p.19 #10 · Techart PRO FAQ


So all of Our TAP's either have, or will have, this wobble problem? Hard to see how a small business could potentially replace that many units and stay solvent. Doesn't seem like much point in sending one back under warranty until the design flaw is fixed and then they should replace them all


Mar 23, 2017 at 07:04 PM
bluloo
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p.19 #11 · p.19 #11 · Techart PRO FAQ


If it is indeed a design flaw, and every unit will prematurely fail, I can't see them replacing every unit, regardless of whether or not it's "fixed" (as a design flaw), and still stay solvent.

Hopefully it's not something that most of us will experience.



Mar 23, 2017 at 07:07 PM
k-h.a.w
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p.19 #12 · p.19 #12 · Techart PRO FAQ


As I see it we all bought into beta testing of a remarkable new gadget. Period.
So, hopefully TAP will improve their adapter and make it more robust.
Then we get to buy the new now regular products.

K-H.




Mar 23, 2017 at 08:25 PM
genji
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p.19 #13 · p.19 #13 · Techart PRO FAQ


ratherfish wrote:
So all of Our TAP's either have, or will have, this wobble problem? Hard to see how a small business could potentially replace that many units and stay solvent. Doesn't seem like much point in sending one back under warranty until the design flaw is fixed and then they should replace them all


Highly unlikely, as you say, that they would replace all the units they've sold but it would take out some of the sting if they offered a trade-in program for current owners who wish to purchase the "improved" model.



Mar 23, 2017 at 11:21 PM
ratherfish
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p.19 #14 · p.19 #14 · Techart PRO FAQ




k-h.a.w wrote:
As I see it we all bought into beta testing of a remarkable new gadget. Period.
So, hopefully TAP will improve their adapter and make it more robust.
Then we get to buy the new now regular products.

K-H.



Expensive beta test. Won't be doing that again. And I think I'll wait to return mine under warranty until they release a new and improved model. Glad I purchased my TAP on my credit card so the warranty is doubled. I'll wait as long as possible. If they don't release a TAP2 in the near future, no more Techart for me.



Mar 24, 2017 at 01:17 AM
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