There’s nothing about any particular lens line that affects whether Techart will work, I think provided
(1) the lens is light enough
(2) an adapter from that lens line to Leica M that fits is available.
There are particular lenses that don’t do as well. I don’t think we have a definitive explanation as to what that is. Leading hypotheses seem to be that extreme principal ray angle is an issue, or that lateral chromatic aberration affects focus. But there seem to be counterexamples to both of these.
I have a vague impression that on average lighter SLR lenses do better than rangefinder lenses, especially in the normal to wide range (if I’m right this is support for the ray angle hypothesis)...Show more →
Thanks for the info! Useful to know. I would use it for a 28mm f2, S-Planar 60mm f2.8 and 100mm f2.
Since I'm a glutton for punishment, I got a LM-EA9 yesterday after having used the previous incarnation of this adapter as well as the Fotodiox Pronto Mk.II (a knock off of the LM-EA7).
It does seem a lot more mechanically stable than the others, the multi-motor design seems like a win, so far at least.
It does mostly focus on the A7rV body, which I was concerned about. In AF-C mode it's actually pretty reliable with most of the lenses I've tried, as long as the focus point is near the center (which is expected, IMO). In AF-S I'd say it doesn't really work usefully. I get a 20-30% hit rate which varies wildly depending on light level, aperture, subject surface, etc.
The A7rV's subject identification and tracking works great but the actual result is only very accurate when the identified focus spot is near the center. Eye-AF works very well indeed, and a normally framed portrait type photo still puts the subject's head and eyes close enough to the center for it to focus accurately, so this is nice nd an improvement over these adapters on earlier AF adapters.
A bunch of LTM lenses with infinity lock buttons (50 Elmar, and the new 40/2.8 Voigtlander for instance) can't work on this adapter because the mechanism hits the adapter rim.
It's still not a thing you can just slap on and forget about, but in AF-C anyway I feel like it's at least usable for real photography rather than as a gimmick.
qqphot wrote:
Since I'm a glutton for punishment, I got a LM-EA9 yesterday after having used the previous incarnation of this adapter as well as the Fotodiox Pronto Mk.II (a knock off of the LM-EA7).
It does seem a lot more mechanically stable than the others, the multi-motor design seems like a win, so far at least.
It does mostly focus on the A7rV body, which I was concerned about. In AF-C mode it's actually pretty reliable with most of the lenses I've tried, as long as the focus point is near the center (which is expected, IMO). In AF-S I'd say it doesn't really work usefully. I get a 20-30% hit rate which varies wildly depending on light level, aperture, subject surface, etc.
The A7rV's subject identification and tracking works great but the actual result is only very accurate when the identified focus spot is near the center. Eye-AF works very well indeed, and a normally framed portrait type photo still puts the subject's head and eyes close enough to the center for it to focus accurately, so this is nice nd an improvement over these adapters on earlier AF adapters.
A bunch of LTM lenses with infinity lock buttons (50 Elmar, and the new 40/2.8 Voigtlander for instance) can't work on this adapter because the mechanism hits the adapter rim.
It's still not a thing you can just slap on and forget about, but in AF-C anyway I feel like it's at least usable for real photography rather than as a gimmick. ...Show more →
That's good to hear. I've been thinking about getting this to use with my A7IV and I appreciate info like.
Hello guys. Has someone encountered non stop hunting issues after a period of non using the adapter (like 2-3 months)? My cameras are Sony A7C, A9 and A7RV.
spotter84 wrote:
Hello guys. Has someone encountered non stop hunting issues after a period of non using the adapter (like 2-3 months)? My cameras are Sony A7C, A9 and A7RV.
I actually had the feeling it worked worse than before.
Will look into that.
spotter84 wrote:
Hello guys. Has someone encountered non stop hunting issues after a period of non using the adapter (like 2-3 months)? My cameras are Sony A7C, A9 and A7RV.
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spotter84 wrote:
For me it seems like sudden mechanical issue. I haven't used lenses havier than 450g. Just once tried for few minutes 7Artisans 75 1.25.
Reset the adapter by taking a picture at F90.
After switched off/on the camera.
BTW, the F90 setting is not mentioned in the manual. If I remember correctly, F90 was the setting to update the firmware via bluetooth with the original TAP (LM-EA7). Apparently now it's a reset aperture setting.
If that does not work, downgrade the firmware to v1.5.0 and do the same "F90" procedure.
spotter84 wrote:
Hello Fred, unfortunately this type of reset didn't help. What was required for the very downgrade?
If you download the TECHART_Update app, you can choose which firmware you want, including downgrading to 1.5. Try this and then reset using the F90 aperture again.
Fwiw in case anyone finds this useful, among the other LTM lenses that physically don't fit on this adapter, the Voigtländer 50mm f/1.5 Nokton will not work because the mount base is slightly too wide to clear the M mount release button. Unfortunate, because it's very close. The VM version of the same lens does fit fine.
