Review: Techart Pro Leica M Sony E Autofocus Adapter

A manual lens needs to be focused manually? Think again! The Techart LM-EA7 turns about any manual lens into an AF lens. For the extended explanation and an in-depth assessment check out this post.


Weight 133 g
Mount M-mount
Extension 4.5 mm
Weight limit lens 700 g
Compatible cameras Sony a7rII, a7ii, a6300, a6500

Please read this thread over at FM carefully. It seems that there is a design fault which will eventually lead some wobble of the adapted lens. Until this issue is fixed by Techart I would advise against buying the LM-EA7.

*update 2022*
Comment by User Yukito: “If you plan to update it maybe you can mention the fact that the Techart Pro works only up to A7RIII. It stopped working (still moves but never gets the lens in focus) with A7RIV, A7SIII, A9.., A1. I think that’s imputable to the PDAF system these new cameras have. A pity Techart seems not to be updating their firmware.”

The Techart PRO LM-EA7 sell for $379 at* or*. In Germany you can buy it at* for 449€.

*=Affiliate Link


The Techart PRO adapter was loaned to me from Techart free of charge.

How it works

If you want to automatically focus your M-mount lens you just attach it to the Techart Adapter, focus the lens manually to infinity, and you are set. Just half-press the shutter button to activate AF and the adapter will focus your lens just like any other AF lens.

The adapter achieves focus just as you would when you focus your lens manually. When you turn the focus ring of you manual lens you change the distance between the sensor and the lens. The LM-EA7 does just the same: It has a variable extension between 0 and 4.5mm.


So, how well does the AF work? Quite well actually but there are some limitations:

In good light the adapter focuses nearly as fast as a native lens and it can be a real help in dynamic situations which may lie outside of your manual focus skills. I think this is a remarkable achievement.

The motor which changes the length of the adapter makes some noise but it is rather unobtrusive and not much of an issue.

To get good results you need to be aware of a couple of things though:

The LM-EA7 relies on the phase detection sensors of your Alpha only, it does not support contrast-AF. Because of this you can only AF where a sensor is. With my a7II they are all grouped around the center, an a6300 will give you more freedom in this aspect. I also found that AF works best with the central AF sensors while it sometimes fails with those off-center. The on-sensor phase AF of my a7II all seem to be of the horizontal kind which will only pick of vertical lines.

Because the Techart relies on phase-AF you can’t use all AF features of your camera, first let me list the ones you can use:

  • The Techart PRO supports AF-S and AF-C.
  • You can change the Focus Area from Wide to Center or Flexible Spot (S/M/L). Decreasing the area comes with a significant speed penalty and some hunting  though.
  • You can also use Face Detection.

Then there are a few features you can’t use:

  • Eye AF doesn’t work.
  • Lock-on AF doesn’t work.

Another limitation is that it doesn’t have the full focus range with lenses above 50mm as they would when focused manually because it would have to extend more than 45mm for that. So if I set the Voigtlander 1.8/75 to infinity the adapter will only focus it down to about 1.5 m while I could focus it down to 0.9 m if I used the focus ring instead. I could set it to 2 m and then the LM-EA7 would focus it down to 0.9 m but it wouldn’t reach infinity anymore. The upside is that it can focus wide angle lenses much closer than you could with a normal adapter.

In lower light AF slows down significantly, it still works well enough usually, but not on the same level as with more light. Probably the camera is to blame for this a lot more than the adapter but none of the less the experience is less smooth in such situations.

So, the AF can be quite helpful if you want to catch a dynamic situation but you have to know its limitations and work around them the get consistent results.

Communicating with the adapter

Since the Techart Pro is a smart adapter you can change some basic settings. You do that by changing the aperture in the camera and pressing the shutter.

Changing focal length

The first function is the focal length the adapter communicates to the camera so that it can calibrate it’s stabilizer.

Here are the f-stops and their corresponding focal length.

  • F11 – Set focal length to 15mm
  • F13 – Set focal length to 18mm
  • F14 – Set focal length to 21mm
  • F16 – Set focal length to 24mm
  • F18 – Set focal length to 25mm
  • F20 – Set focal length to 28mm
  • F22 – Set focal length to 35mm
  • F25 – Set focal length to 50mm
  • F29 – Set focal length to 90mm
  • F32 – Set focal length to 135mm

I found this function quite handy when I used just my Voigtlander 1.7/35 and a few other lenses with conventional adapters because while I had to change the focal length manually for my other lenses I didn’t have to with the Voigtlander. But when I also had the Voigtlander 1.8/75 with me it would have been faster to change the focal length in the camera which I couldn’t because my SteadyShot-setting was set to Auto. So I had to turn the aperture dial 23 clicks, take a picture and turn it back 23 clicks which is a bit annoying.

The situation eased a bit when I downloaded the configuration app and reconfigured F11 to 35mm and F13 to 75mm. You can also configure an F-stop in the app but this has no effect and the camera will write the set focal length, f/2 and DT 40mm F2.8 to the exif file. It would be great if a future firmware update would fix that.

Changing the parking position

The other setting you can change is the parking position the adapter goes to when AF is disabled.

  • F36 – Park adapter at minimal extension (infinity)
  • F40 – Park adapter to maximal extension (closest focus)
  • F45 – Park adapter at current extension

When you set the adapter to the minimal extension it focuses way beyond infinity with my Voigtlander 1.7/35 which I have to set to 5m to achieve actual infinity focus.

When you set the adapter to maximal extension it works like a 4.5 mm extension tube. This is really handy especially with rangefinder lenses because they usually have a very long minimal focus distance. The wider the lens, the stronger the effect will be. Check out Bastian’s Voigtlander Close-Focus adapter review for a more detailed discussion of this effect.

My Voigtlander 1.7/35 at its normal short focusing distance of 0.5m and with full extension.

I found that the close focusing feature is very nice to have indeed and it allowed me to take some pictures I otherwise couldn’t have taken but I also found it quite annoying to activate it. To activate it you have to turn the aperture dial 26 clicks, take a picture and turn it back 26 clicks. Working in A-mode I also had to point the camera at the brightest spot I could find and turn the exposure down because otherwise I would end up with an exposure lasting several seconds which slowed the process down even more. Maybe Techart could add a switch for the configuration in a next generation of this adapter which would improve the operation a lot.

Voigtlander 1.7/35 VM at the close focusing distance

Updating the firmware

The Techart’s firmware can be upgraded which is a nice feature because Teachart can add features and improve the functionality as they have done in the past. The process isn’t the smoothest but it works which is what counts. To update the firmware download the Techart app from you appstore or their website and follow the instructions on the same site. The process takes about 10 minutes.

Build Quality

There is no play with the lenses I have used and the adapter also feels quite solid. For a look into the adapter check out this post. Of course I can’t tell you about sample variation with just one adapter.

The LM-EA7 isn’t fully encased and there are two not that small gaps below where the lens sits. I could well imagine that one or two rain drops could put the adapter out of commission. I am rather hesitant to use my a7ii in bad weather but with the Techart I would be even more careful.

I should mention though that the first copy I got was defective and I have read a few reports of other defective copies as well. As far as I am aware those issues were sorted out quickly to the customers satisfaction by the service.


The Techart Pro LM-EA7 with it’s 133 g adds a noticeable amount of weight to your kit  and the necessary motor and mechanics take up some space as well. The camera won’t sit flat on a surface unless you use an L-bracket (which won’t be of any use for mounting the camera in landscape orientation to a tripod head because it is blocked by the adapter).

One aspect I like a lot about it is that you can turn it off and use your manual lens just like any other manual lens with a proper focusing ring and only when you feel like you need AF you switch your camera to AF. For someone  like me who usually prefers to focus manually this is a big deal because with AF lenses you usually have the choice between good AF and annoying manual focus. With the Techart Pro you have the choice between decent AF and great manual focus with the added bonus of increased close focusing abilities.

Things you should be aware of

Using non-M-mount lenses

The Techart PRO has a Leica M-mount but you aren’t limited to M-mount lenses. You can buy adapters for about any lens mount to M-mount and turn them into AF lenses that way. Not any adapter to M-mount will fit though. Leicaist adapters are a safe bet, for a more detailed list of adapters which are confirmed to work check out the FAQ over at FM.

Also note that Techart specifies a weight limit of 700 g for lenses. This will be hard to exceed with a M-mount lens but if you add an adapter many SLR lenses will exceed it. Other users have reported that they used much heavier lenses successfully by supporting the lens and not the lighter camera.

Affect on Images Quality

The adapter can have a negative effect on image quality for lenses with floating elements. If you use a unit focusing lens image quality won’t be affected at all. Very few rangefinder lenses use floating elements but you might get issues with wider SLR lenses if you adapt them.

A Bug and a Workaround

The Techart adapter slowly drains your Alpha’s battery even when the camera is turned off. There is a workaround though: Just remove the battery and insert it again right away. Now the Teachart shouldn’t drain any power.

Other Resources

The folks over at have compiled an extensive FAQ which made the job of creating this review much easier. A big thank you to the user Genji and all the others that contributed.



  • Offers good AF with manual lenses
  • Extends the close focusing abilities of your lens
  • Solid build quality
  • Firmware can be updated

  • Some Noise
  • Price
  • Weight limit for the lens of 700 g

  • Only focuses reliable in the center of the image
  • Slowly drains the battery even when it is turned off
  • Sometimes complicated operation

So all in all the Techart Pro LM-EA7 does indeed provide decent AF and it can be a helpful tool if you need to focus your manual lenses quickly or if you struggle to get consistent results focusing them manually.  And if you feel to use manual focus instead you can just turn the AF off and enjoy your proper focusing ring and the extended close focusing abilities. I think that Techart deserves respect for creating this new and unconventional tool but just like the a7 was a first generation product with a few quirks, the Techart Pro isn’t without issues.  None of these issues are too serious though.

Personally though I found that I don’t really need AF and I still enjoy focusing manually so the Techart isn’t for me. I wouldn’t hesitate to recommend it to those who feel they would benefit from AF.

Please read this thread over at FM carefully. It seems that there is a design fault which will eventually lead some wobble of the adapted lens. Until this issue is fixed by Techart I would advise against buying the LM-EA7.
The Techart PRO LM-EA7 sell for $379 at* or*. In Germany you can buy it at* for 449€. If this review was helpful to you, please consider using one of my affiliate links marked with *. Thanks ?

Another image I couldn’t have captured without the adapter

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38 thoughts on “Review: Techart Pro Leica M Sony E Autofocus Adapter”

  1. Phillip,

    in DE and the EC it is much cheaper to buy directly from instead from purchasing at ebay.
    Due to UK’s historical link with Hong Kong, they can bring goods from there toll free into UK and so can ship EC orders from there – without import hassles for the customers. At least as long as Brexit isn’t fully executed 🙂

    Thanks as always for your reviews!

    1. whoa, so that is why so many cameras on coming from UK are that much cheaper. Holy crap ! thanks for info

  2. thanks for the review 😀
    cant wait until my delivery arrives…
    how long did u wait for youre copy?
    greez from constance

  3. Would love it if they had a techart for reflex lenses with an extended range of say 6-7 mm to tke advantage f the increased space. Moreover, I don’t trust having 2 adapters in series at this price. Do you know whether they are preparing other versions?

    1. An ‘in series’ adapter for M42, Minolta MC/MD, Pentax P/K or whatever to Leica M is no more than a metal link. There are no contacts, and once fitted, it’s completely seamless so I’m puzzled by what you’re not trusting at this price. And it’s surely better (IMV) to be able to adapt the Techart to a multitude of lens mounts than to need to buy one for each.

  4. Danke fürs review, hab deinen link im DSLR forum angeklickt.
    Weil ich derzeit auf mein exemplar für die a7II warte, eine frage: Welche firmware hatte die a7II, bzw ab welcher firmware kann die kamera phase-detection?
    Und erscheinen die entsprechenden optionen im kamera menu erst dann, wenn der adapter angeschlossen ist?

      1. Danke für die schnelle antwort, bin gespannt wie der adapter in der praxis funktioniert mit meinen alten gläsern. Und ob auch der parallel bestellte nikon zu leica adapter dran passt…(ich habe leica und nikon im schrank).

  5. New firmware is out, one question concerning the app. Are you sure that the settings infinity or closet are working? My adapter always goes to infinity mf position independent what I have set with the app?

    1. Now that you ask: I think it worked right after I configured it (not 100% sure about that) but not after I restarted the camera. I removed that part.
      And Fred Miranda reports that the battery drainage isn’t fixed by FW 5.0.

  6. Hey mate, thanks for the article, very useful !
    Do you know if they will update the firmware to work
    with the new a7iii ?
    Also does the auto focus (and the face Detect) will work in video mode?
    Would love to mount that on a gimbal and use autofocus with my voigtlander lenses.

  7. I’ve been using the Techart adapter with A7RII for quite a while with different lenses, and discovered that the effective PDAF coverage area is different for different lenses, so not all lenses can AF using all the 399 PDAF points. When using flexible spot AF and position to the leftmost/rightmost PDAF area, the adapter may just hunt for focus, without any dancing green dots appearing at all.
    Below are some lenses I’ve tested with the LM-EA7 adapter, all lenses have their aperture set to wide open during the test.
    Voigtlander 21mm f/1.8: center 33% width coverage
    Nikon 35mm f/2D: full area coverage
    Leica Summicron 35mm IV: full area coverage
    Voigtlander Ultron 35mm f/1.7: center 33% width coverage
    Minolta MC Rokkor-PG 58mm f/1.2: full area coverage
    Zeiss C/Y Planar 100mm f/2: center ~50% width coverage
    In general, vertical area coverage is not an issue, as all tested lenses can AF using the center upmost and center bottom PDA F areas. What matters is horizontal PDAF area coverage.
    Based on the test result, my wild guess is that the AF issue has something to do with field curvature of the lens.

    It would be great if there is a review article showing PDAF coverage differences among different lenses. As of now, there is no online article / YouTube video showing this. All of the YouTube videos I saw are just showing AF speed of the central AF points only. The PDAF area coverage info would be particularly interesting for Techart adapter users.
    For me, I am particularly interested in how the Zeiss 35mm 1.4 ZM performs with LM-EA7.

  8. Surely, some other manufacturer or Techart will come and create a better version… Great idea…apparently poor delivery but could probably be fixed. Just a pity current programmed Obsolescence strategies prevent serious manufacturer (Leica, Sony or others) to offer this for their camera or their manual lenses. Having one AF tool for a family of lenses looks like an efficient and seductive idea

  9. Phillip, I didn’t understand the connection you wrote about between the f stop/shutter button configuration of the Adapters stored focal lenghts and the steady shot settings. Can you explain?

    Both have no connection. Unfortunately also the suggested shutter speed (fast/faster etc.) in auto settings of auto ISO min VS Ddoesnt make use of the steady shot shutter speed selection.

    BTW: did you Test if it is important to set steady shot focal length to manual and correct focal length for manual lenses?

  10. Could you please update if we can use with A7iii? is the eye af work? I have plan to use with Voigtlander 40mmf1.2
    and the issue that you mention
    “Please read this thread over at FM carefully. It seems that there is a design fault which will eventually lead some wobble of the adapted lens. Until this issue is fixed by Techart I would advise against buying the LM-EA7.”
    Do you know is it fix now?

    Thank you

  11. It`s a new life form my manual, vintage lenses. Even for M39, M42 lenses with the additional, second adapter. Works very well after update firmware 7.0 (2021).

  12. Thank you for this review. If you plan to update it maybe you can mention the fact that the Techart Pro works only up to A7RIII. It stopped working (still moves but never gets the lens in focus) with A7RIV, A7SIII, A9.., A1. I think that’s imputable to the PDAF system these new cameras have. A pity Techart seems not to be updating their firmware.

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