Lens converter rings

[G0KOK]

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Hi all when a converter ring/ flange whatever you like to call it is used to say fit an L39 screw lens to a M fitting camera, does the thickness of the ring change the scale reading relative to the rangefinder,  or, is that taken into account.

Thanks.

Peter.

[a.noctilux]

Hello Peter,

No worry if the adaptor is Leitz type which must be 1.00mm thick.

Rangefinder focussing or coupling as usual.

When Leitz launched M3 in 1954, they took that in mind, user may mount their LTM lenses on the then new M mount.

have a read here

Three adapter types to index the right frame lines on M6 or later Ms : 28/90, 50/75, 35/135

Beware of lesser cheaply made adaptor from other makers, if not Voigtlander which I use sometimes.

Those older 39mm lenses are nice on Monochrom and other Ms 😄.

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Trio LTM Elmar/Summaron adapted to Monochrom gives very nice results.

 

Edited October 29, 2020 by a.noctilux

[jdlaing]

3 hours ago, G0KOK said:

Hi all when a converter ring/ flange whatever you like to call it is used to say fit an L39 screw lens to a M fitting camera, does the thickness of the ring change the scale reading relative to the rangefinder,  or, is that taken into account.

Thanks.

Peter.

No. They generally do not.

[Ecar]

Not sure what you mean by "scale reading": rangefinder focusing or position of markings on the lens barrel?

If you meant the latter, the adapter thickness will have no effect, but slight differences in the thread's starting point and/or length may tilt the scale markings one way or another.

If you meant the former, here's a quick rundown of potential issues to consider (try searching the forum, this topic has been covered several times):

If you are planning to use LV/EVF on an M10, most Leica/Leitz and earlier Voigtlander LTM to M adapters won't let you do it as they have a cutout where the 6-bit code sensor is located. You will then see a "no lens detected" message and LV/EVF will not work. There are workarounds (eg, tape) but they are not particularly elegant nor durable.

Irrespective of the camera you will be using, and unless you are going to use exclusively a film body, your safest and future-proof bet is therefore a "6-bit adapter". The cheapest ones are luck of the draw, as tolerances often vary and may throw focus off - I have stopped buying them long ago. Rayqual are currently the best IMO, followed by Fotodiox and a couple of eBay sellers (heavystar, jinfinance). In this case, you generally get what you pay for.

Finally, the choice of 6-bit adapters is further reduced for some (but not all) lenses with infinity lock, where an additional cutoff is required in order to be able to fully depress the spring lock.

[Matlock]

1 hour ago, Ecar said:

If you are planning to use LV/EVF on an M10, most Leica/Leitz and earlier Voigtlander LTM to M adapters won't let you do it as they have a cutout where the 6-bit code sensor is located. You will then see a "no lens detected" message and LV/EVF will not work. There are workarounds (eg, tape) but they are not particularly elegant nor durable.

 

That is not quite correct. When "no lens detected" message comes up, switch to manual selection on the main menu and you are good to go.

[Ecar]

1 hour ago, Matlock said:

That is not quite correct. When "no lens detected" message comes up, switch to manual selection on the main menu and you are good to go.

You can do this on the M240, not on the M10, where you'll get LV/EVF perhaps for a few seconds at best and it will switch off as soon as light hits the 6-bit sensor, even tangentially. Perhaps Leica changed this behaviour on the M10P or M10R, which I don't own?

Edited October 29, 2020 by Ecar

[plaidshirts]

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I had an issue with a generic adapter for my Elmar 35/3.5 and the problem was solved with a Voigtlander version.

Read below for details:

 

[Matlock]

8 hours ago, Ecar said:

You can do this on the M240, not on the M10, where you'll get LV/EVF perhaps for a few seconds at best and it will switch off as soon as light hits the 6-bit sensor, even tangentially. Perhaps Leica changed this behaviour on the M10P or M10R, which I don't own?

Well it works perfectly with my M10, M10-D and M10-R. Maybe down to what adaptor you use, I am using Leica ones.

 

[250swb]

A. Noctilux's photo above shows the type of adapter NOT to use on a digital M, the type with the cutout. And I agree with Ecar, I picked up a lens I'd been using with a film M with a cutout adapter and using it on my M10 caused the LV and EVF to switch off, the sensor needs to be completely blanked off. There is one other issue with the cutout adapter which relates to light leaks with long exposures. It is possible to get a light leak anyway with a normal M lens with long exposures and the light comes in from where the sensor sits on the mount and a cutout adapter makes this much, much worse.

[a.noctilux]

On my Monochrom, the ring works like it should for years, as on film Ms.

Nothing to complain, Monochrom + cutout 39-M Leitz ring + whatever LTM lens , lens detection "off" of course.

 

[Ecar]

5 hours ago, Matlock said:

Well it works perfectly with my M10, M10-D and M10-R. Maybe down to what adaptor you use, I am using Leica ones.

Then your adapters must looks like this, without cutout (I have a few of these too):

https://www.ebay.com/itm/Ernst-Leitz-Leica-9cm-90mm-LTM-Screw-to-M-Lens-Bayonet-Adapter-14098-M2-M3-M8-M9/143640690727?hash=item2171a70027:g:oEcAAOSw269e9IPa

 

However, those that look like this will cause LV/EVF to switch off:

https://www.ebay.com/itm/LEICA-M-ADAPTER-LTM-M39-90MM-SCREW-MOUNT-LENSES-M2-M3-CAMERAS-ISBOO-14098/153796040327?hash=item23cef55687:g:t1kAAOSwfcNeHaf2

If you read my first post again, you will notice that I was referring to the latter (with cutout under the LWG DBP engraving - and more commonly available on the used market).

[Matlock]

2 hours ago, Ecar said:

Then your adapters must looks like this, without cutout (I have a few of these too):

https://www.ebay.com/itm/Ernst-Leitz-Leica-9cm-90mm-LTM-Screw-to-M-Lens-Bayonet-Adapter-14098-M2-M3-M8-M9/143640690727?hash=item2171a70027:g:oEcAAOSw269e9IPa

 

However, those that look like this will cause LV/EVF to switch off:

https://www.ebay.com/itm/LEICA-M-ADAPTER-LTM-M39-90MM-SCREW-MOUNT-LENSES-M2-M3-CAMERAS-ISBOO-14098/153796040327?hash=item23cef55687:g:t1kAAOSwfcNeHaf2

If you read my first post again, you will notice that I was referring to the latter (with cutout under the LWG DBP engraving - and more commonly available on the used market).

No strangely the adaptor I was using was a Leica WITH cutouts. Tried it with a Voigtlander with cutouts and, as expected, no joy. My Leica adaptor must be slightly out then 🙂 .