Manual Lens Coding - am I missing a trick?

[camnoj]

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Having bought an M8 earlier this year, WOW what a camera but . . . I have two lenses a CV 28mm f1.9 and a CV 50mm f1.5 I have coded both lenses with a Sharpie and they work indoors when I test them . However when I take them outdoors to use in broad daylight the coding no longer works. If I return into the house the coding works. Am I missing a trick? I have a Leica 75mm which is coded this lens works fine indoors or outdoors so I'm reasonably sure it's not the camera.

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[jaapv]

Are those LTM lenses on a adapter ring?In that case light may leak onto the diodes.

[camnoj]

Hi Jaapv

 

Thanks for the quick reply I have looked at the adapter and they are on the correct adapter but there is a 1mm gap between the camera body and the lense adapter face that is closest to the camera body. Therefore light can flood into the area where the diodes are located. Is there a graceful way around this problem or is it a matter of apply a bit of tape to keep the light out - a messy solution?

 

camnoj

[jaapv]

The most elegant solution is of course to get a couple of Jonh Milich's adapters with coding dents.

[camnoj]

Can you point me in the right direction?

[jaapv]

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[camnoj]

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Thanks for your help Jaap

[camnoj]

Coming from an engineering background an alternative but not so graceful solution is an elastic band around the base of the lens before engaging the lens into the bayonet protects the diodes from direct light and presto it works. Thanks for the explaination of what the problem was without your help I wouldn't have solved it. I might still splash out on a Milich adapter some time.

 

If anyone wants to know how I solved the problem and can't understand my sketchy description drop me a line and I'll upload a photograph.

 

Otherwise once again many thanks Jaap.

[parigby]

I can confirm that the Milich adaptor is the elegant way to go, having obtained one for use with my CV 15mm. Excellent results from both the adaptor and lens.

[bocaburger]

I use Leitz LTM-M adapters on 15,21,28 and 75 C/V lenses plus a Nikkor and of course Leitz LTM lenses. No gaps. There are 2 types of adapter however, one with just 3 little cutouts around the rim (for the unscrewing lugs found on old rear plastic caps) and another with a large area cut away. The latter is unusable for coding because the area that needs the code is where the cut away is. I also coded a couple of Cosina adapters (type II, without that unfortunate cut away) for a friend, with no gaps and no problem.