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Techart Pro LM-EA9 Review

  
 
nehemiahphoto
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p.5 #1 · p.5 #1 · Techart Pro LM-EA9 Review


DavidBM wrote:
I ordered direct from Techart, which - oddly - appears to be the only way you get a guarantee! Itís shipped and arrives in the next couple of days.


Interesting. I ordered mine from B+H several days ago, still says pre-order. Maybe I should cancel and order from Techart as they are already shipping.



Aug 28, 2022 at 03:39 PM
pompo
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p.5 #2 · p.5 #2 · Techart Pro LM-EA9 Review


Don't forget that is for some reasons you need to exchange it/return it, with B&H will be much easier!


Aug 28, 2022 at 07:13 PM
esanchez
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p.5 #3 · p.5 #3 · Techart Pro LM-EA9 Review


I ordered mine on the 17 from Techart and they haven't shipped anything yet. It just shows processing whatever that means.


Aug 28, 2022 at 08:19 PM
DavidBM
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p.5 #4 · p.5 #4 · Techart Pro LM-EA9 Review


Mine arrived from TechArt

Itís interesting what it works well on and doesnít.

Itís great on my Zuiko 1.2/55, not so great on my Zuiko 1.2/50 (hats the difference), great on 2/28 but terrible on 2.8/28 - which is sharper than the f2 version.



Aug 29, 2022 at 12:29 AM
esanchez
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p.5 #5 · p.5 #5 · Techart Pro LM-EA9 Review


why is that and what do you think is causing this?

DavidBM wrote:
Mine arrived from TechArt

Itís interesting what it works well on and doesnít.

Itís great on my Zuiko 1.2/55, not so great on my Zuiko 1.2/50 (hats the difference), great on 2/28 but terrible on 2.8/28 - which is sharper than the f2 version.





Aug 29, 2022 at 09:05 AM
Steve Spencer
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p.5 #6 · p.5 #6 · Techart Pro LM-EA9 Review


DavidBM wrote:
Mine arrived from TechArt

Itís interesting what it works well on and doesnít.

Itís great on my Zuiko 1.2/55, not so great on my Zuiko 1.2/50 (hats the difference), great on 2/28 but terrible on 2.8/28 - which is sharper than the f2 version.


Well that is baffling. I can't think of any reason for different performance from such similar lenses.



Aug 29, 2022 at 09:23 AM
pompo
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p.5 #7 · p.5 #7 · Techart Pro LM-EA9 Review


I'm getting worried now! I hope it'll work fine with Noctilux 0.95!


Aug 29, 2022 at 07:15 PM
DavidBM
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p.5 #8 · p.5 #8 · Techart Pro LM-EA9 Review


esanchez wrote:
why is that and what do you think is causing this?



If I had a good theory I would have shared it!

My guess - and it's an extreme guess - is that there are two factors;

(1) The degree of telecentricity of these lenses might vary; and more telecentric lenses might AF better in the outer field

(2) is the exact amount and type of lateral CA might confuse the AF in the outer field to different degrees.

It works fine in the inner area though!



Aug 30, 2022 at 05:45 AM
Fred Miranda
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p.5 #9 · p.5 #9 · Techart Pro LM-EA9 Review


DavidBM wrote:
If I had a good theory I would have shared it!

My guess - and it's an extreme guess - is that there are two factors;

(1) The degree of telecentricity of these lenses might vary; and more telecentric lenses might AF better in the outer field

(2) is the exact amount and type of lateral CA might confuse the AF in the outer field to different degrees.

It works fine in the inner area though!


Hi David,
Did you upgrade to the latest version? They keep tweaking it.



Aug 30, 2022 at 01:46 PM
DavidBM
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p.5 #10 · p.5 #10 · Techart Pro LM-EA9 Review


Fred Miranda wrote:
Hi David,
Did you upgrade to the latest version? They keep tweaking it.


Yep!

Gotta say Iím pretty happy with it. It works just fine in the central box of a ROT grid on every lens Iíve tried, and variability in the outer field is to be expected. Iím more surprised how good it is in the outer field on some lenses, than disappointed that it doesnít work so well there on others!



Aug 31, 2022 at 06:34 AM
 


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Fred Miranda
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p.5 #11 · p.5 #11 · Techart Pro LM-EA9 Review


DavidBM wrote:
Yep!

Gotta say Iím pretty happy with it. It works just fine in the central box of a ROT grid on every lens Iíve tried, and variability in the outer field is to be expected. Iím more surprised how good it is in the outer field on some lenses, than disappointed that it doesnít work so well there on others!


My guess is that the lens with lower performance has a mid-field dip wide open?



Aug 31, 2022 at 08:22 AM
BastianK
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p.5 #12 · p.5 #12 · Techart Pro LM-EA9 Review


Fred Miranda wrote:
My guess is that the lens with lower performance has a mid-field dip wide open?

By my experience it has nothing to do with that.
I tried it with very high resolving lenses and it doesn't work at all outside the central area whereas it "magically" works with actually pretty bad lenses (resolution/contrast wise) right into the corners.

My guess is still that the AF algorithm needs information on the lateral CA of the lens to make proper use of the phase detect pixels.
I don't have enough (or any) knowledge about the AF algorithms and if lateral CA correction is already applied before the focus operation though, which would be a clear indicator of my theory.



Aug 31, 2022 at 08:42 AM
Fred Miranda
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p.5 #13 · p.5 #13 · Techart Pro LM-EA9 Review


BastianK wrote:
By my experience it has nothing to do with that.
I tried it with very high resolving lenses and it doesn't work at all outside the central area whereas it "magically" works with actually pretty bad lenses (resolution/contrast wise) right into the corners.

My guess is still that the AF algorithm needs information on the lateral CA of the lens to make proper use of the phase detect pixels.
I don't have enough (or any) knowledge about the AF algorithms and if lateral CA correction is already applied before the focus operation though, which would be a clear indicator of my theory.


I've asked Techart about this. Let's see what they say.



Aug 31, 2022 at 08:57 AM
BastianK
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p.5 #14 · p.5 #14 · Techart Pro LM-EA9 Review


Fred Miranda wrote:
I've asked Techart about this. Let's see what they say.

I even sent them videos of the good working and (similar) not well working lenses.
Conclusion: they don't have a clue why some lenses work well and others don't.



Aug 31, 2022 at 09:08 AM
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p.5 #15 · p.5 #15 · Techart Pro LM-EA9 Review


BastianK wrote:
I even sent them videos of the good working and (similar) not well working lenses.
Conclusion: they don't have a clue why some lenses work well and others don't.





Aug 31, 2022 at 09:22 AM
lattesweden
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p.5 #16 · p.5 #16 · Techart Pro LM-EA9 Review


Fred Miranda wrote:
I've asked Techart about this. Let's see what they say.


I'm still waiting for my adapter (ordered on the 10th). A question: Those lenses that work or don't work in the corners, is there any difference between focusing them on "dead" objects or on people with the Face Detect/Eye-AF? If I remember correctly, the Face Detect/Eye-AF uses the CDAF more, than the PDAF, that is why I ask. Thanks!



Aug 31, 2022 at 10:06 AM
BastianK
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p.5 #17 · p.5 #17 · Techart Pro LM-EA9 Review


lattesweden wrote:
I'm still waiting for my adapter (ordered on the 10th). A question: Those lenses that work or don't work in the corners, is there any difference between focusing them on "dead" objects or on people with the Face Detect/Eye-AF? If I remember correctly, the Face Detect/Eye-AF uses the CDAF more, than the PDAF, that is why I ask. Thanks!

I saw absolutely zero difference. Either it works or it doesn't.



Aug 31, 2022 at 12:03 PM
lattesweden
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p.5 #18 · p.5 #18 · Techart Pro LM-EA9 Review


BastianK wrote:
I saw absolutely zero difference. Either it works or it doesn't.


Thanks! Good to know, then I can just test all my vintage lenses at home on static scenes and single out which ones work good and not.



Aug 31, 2022 at 12:27 PM
bemei
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p.5 #19 · p.5 #19 · Techart Pro LM-EA9 Review


Does stopping down the 'problem' lenses cure the problem?


Aug 31, 2022 at 12:34 PM
BastianK
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p.5 #20 · p.5 #20 · Techart Pro LM-EA9 Review


bemei wrote:
Does stopping down the 'problem' lenses cure the problem?

Not to the slightest, no. Either it works in the corners or it doesn't.
At least for the ~15 lenses I tried so far.



Aug 31, 2022 at 04:07 PM
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