The SHOTEN LM-CR ME is a mount conversion adapter that allows Leica M-mount lenses to be used with Canon RF-mount mirrorless cameras. It features electronic contacts that support EXIF recording and focus guides, transmitting various information to the camera (AF is not supported). Furthermore, a 4mm helicoid extension shortens the lens’s minimum focusing distance, allowing you to get closer to your subject.
Features:
- Equipped with a 4mm extension helicoid, it shortens the lens’s minimum focusing distance.
- Compatible with camera focus guides, supporting faster and more accurate focusing.
- Ten types of lens information (focal length/maximum aperture value) can be recorded in the EXIF information.
- Built-in lens data (lens name/focal length/maximum aperture) can be edited on a PC, and up to 10 lenses can be registered.
- Equipped with an infinity lock function to prevent accidental operation of the helicoid.
p.1 #2 · SHOTEN focus confirmation adapter for Leica M to Canon RF
I saw that earlier this morning and got excited. As I watched the video I started to wonder how it worked.
Seems they use the F-stop at some point to select and identify the stored lens identity. F8,F9,F10,F11, F13,F14,F16,F18,F20 and F22 which the cross reference is stored in the adapter.
As to sending the EXIF data to the camera it reminds me of the programmable EF chips where you have to push additional buttons to get all the EXIF data ready to be sent to the camera.
Given M lenses do not have electronic communication, the fstop must be set on the lens then likely set the Fstop manually on the camera which doesn't effect the lens and is only used for recording purposes only.
It is an interesting useful adapter but not one where you can point and shoot to get all the EXIF data without extra steps in prepping the camera to receive some EXIF data based on the settings you used.
p.1 #3 · SHOTEN focus confirmation adapter for Leica M to Canon RF
Yes, it is similar to Techart af adapter which I am using on Sony. It reports all the info, but not the aperture. Only Leica cameras have the lens profiles with auto corrections. However Canon with this adapter has the focus confirmation for precise manual focus as shown in first video...
burningheart wrote:
I saw that earlier this morning and got excited. As I watched the video I started to wonder how it worked.
Seems they use the F-stop at some point to select and identify the stored lens identity. F8,F9,F10,F11, F13,F14,F16,F18,F20 and F22 which the cross reference is stored in the adapter.
As to sending the EXIF data to the camera it reminds me of the programmable EF chips where you have to push additional buttons to get all the EXIF data ready to be sent to the camera.
Given M lenses do not have electronic communication, the fstop must be set on the lens then likely set the Fstop manually on the camera which doesn't effect the lens and is only used for recording purposes only.
It is an interesting useful adapter but not one where you can point and shoot to get all the EXIF data without extra steps in prepping the camera to receive some EXIF data based on the settings you used....Show more →
p.1 #5 · SHOTEN focus confirmation adapter for Leica M to Canon RF
Hmm, I like this.
In theory this adapter could be a go between the camera and other lens mounts via adapter stacking to enable the focus assist feature with a very wide range of adapted lenses.
Hopefully it's not a 'get it while you can' situation before Canon serves them with a cease and desist...
p.1 #6 · SHOTEN focus confirmation adapter for Leica M to Canon RF
Focus Studio Co., Ltd., based in Japan, is a manufacturer specializing in high-quality camera lens mount adapters under the brand name Shoten.... Since the company is based in Japan, hopefully they got the Canon approval.
rscheffler wrote:
Hmm, I like this.
In theory this adapter could be a go between the camera and other lens mounts via adapter stacking to enable the focus assist feature with a very wide range of adapted lenses.
Hopefully it's not a 'get it while you can' situation before Canon serves them with a cease and desist...
p.1 #7 · SHOTEN focus confirmation adapter for Leica M to Canon RF
serhan_ wrote:
Focus Studio Co., Ltd., based in Japan, is a manufacturer specializing in high-quality camera lens mount adapters under the brand name Shoten.... Since the company is based in Japan, hopefully they got the Canon approval.
what are they going to do? sue a mom and pop company! the cost is more plus these will be manual focus lenses
p.1 #8 · SHOTEN focus confirmation adapter for Leica M to Canon RF
rscheffler wrote:
Hmm, I like this.
In theory this adapter could be a go between the camera and other lens mounts via adapter stacking to enable the focus assist feature with a very wide range of adapted lenses.
That's what I was thinking for my FD and Leica R glass. Stack an FD-M or R-M adapter with this adapter. Not to mention just use with native M glass.
I would be constantly changing the 10 lenses on the adapter via the computer to whatever glass I was using. Still having focus confirm and the actual lens I was using in the EXIF beats having to write down on paper or taking a picture from my tiny notebook saying what lens it was.
Feb 22, 2026 at 11:01 PM
Steve Spencer Offline • • • • • • • Upload & Sell: On
p.1 #9 · SHOTEN focus confirmation adapter for Leica M to Canon RF
burningheart wrote:
That's what I was thinking for my FD and Leica R glass. Stack an FD-M or R-M adapter with this adapter. Not to mention just use with native M glass.
I would be constantly changing the 10 lenses on the adapter via the computer to whatever glass I was using. Still having focus confirm and the actual lens I was using in the EXIF beats having to write down on paper or taking a picture from my tiny notebook saying what lens it was.
It is also important for IBIS that the camera knows the correct focal length so IBIS can work properly. Having both focus confirmation and extension is great as well. Looks like a really useful adapter and previous Shoten adapters I think have been well made or at least that is the reports I have heard.
p.1 #10 · SHOTEN focus confirmation adapter for Leica M to Canon RF
Pretty cool as Canon‘s focus guide is the best MF assist tool available in any camera. I don’t love having to use the aperture values to define the lens but I guess they have to use some sort of workaround like that if they can’t put a button + lcd on the adapter
p.1 #13 · SHOTEN focus confirmation adapter for Leica M to Canon RF
fjablo wrote:
Pretty cool as Canon‘s focus guide is the best MF assist tool available in any camera. I don’t love having to use the aperture values to define the lens but I guess they have to use some sort of workaround like that if they can’t put a button + lcd on the adapter
Not sure if Canon’s or Nikon’s is the best. All I know is that Leica’s 10k camera is not.
p.1 #15 · SHOTEN focus confirmation adapter for Leica M to Canon RF
tomba8tomba wrote:
„ The seller doesn't currently ship to: Germany
- Update your shipping address and try again.
- Or find similar items from another seller.“
:-(
That’s strange. Why not Germany? Maybe reach out to them and see if it’s a mistake. The other exceptions seem logical.
p.1 #16 · SHOTEN focus confirmation adapter for Leica M to Canon RF
johnvanr wrote:
Not sure if Canon’s or Nikon’s is the best. All I know is that Leica’s 10k camera is not.
It's all about the types of information that are given to the user without having to zoom in.
Nikon tells you whether you are in focus or not, which is great.
But Canon tells you whether you are in focus or not, how far out you are and whether you are focusing in the right direction.
So basically Canon's focus guide feature gives you the same types of information that an optical rangefinder gives, just in a different interface and based off the on-sensor PDAF. I had expected Leica to do something very similar with the EV-1, but I guess it required too much R&D. Maybe they'll fix it with the EV-2
What is annoying - and these adapters proof it all the time - is that both Canon and Nikon could easily enable these functions with *all* adapted lenses. They just choose to limit it to lenses that communicate a focal length (which is something you could set via the camera menu).
p.1 #17 · SHOTEN focus confirmation adapter for Leica M to Canon RF
I previously purchased the Boryoza LM-RF II Macro Focus Lens Adapter for Leica M Lens to Canon RF. It looks like the same electronics and solution. It hasn't arrived yet – I'm waiting.
p.1 #19 · SHOTEN focus confirmation adapter for Leica M to Canon RF
Boryoza version is cheaper @ $169 from China...
Shoten adapter shipped yesterday from Japan and will be in US tomorrow by DHL...
szwayko wrote:
I previously purchased the Boryoza LM-RF II Macro Focus Lens Adapter for Leica M Lens to Canon RF. It looks like the same electronics and solution. It hasn't arrived yet – I'm waiting.
p.1 #20 · SHOTEN focus confirmation adapter for Leica M to Canon RF
serhan_ wrote:
Focus Studio Co., Ltd., based in Japan, is a manufacturer specializing in high-quality camera lens mount adapters under the brand name Shoten.... Since the company is based in Japan, hopefully they got the Canon approval.
They have some interesting things on their website. But their website also says they are an importer of lenses and adapters. I strongly suspect it's not made by them and probably the same as the other one posted earlier, just rebranded.
If they get shut down by Canon, at least there's also the option to source directly from China (though potentially more of a hassle).
They do have an interesting port of a Schneider 50/2.2 lens to Leica M mount under their Focus Studio brand that I saw listed at Map Camera...
