Light leak when Noctilux is attached to M10 durning long exposures

[Guest]

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This happened to me years ago when I had my M9 (I think). If I was taking a picture of a waterfall at say 5 to 10 seconds I would get light leaking onto the sensor via the bayonet connection, at that time the only way I could cure it was but using one of my wife's Hair band wrapped around the lens.......seems like the same issue exists on there latest M10 (bottom left)

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Hair band

photoshop corrected

 

Neil

 

Neil

[hteasley]

Same lens? Mount is probably not true. Send it for repair.

[250swb]

6 hours ago, hteasley said:

Same lens? Mount is probably not true. Send it for repair.

No, it's a common problem with the Leica mount and long exposures. I'd contend that it leaks from the bayonet lock as Neil says. But light does leak in around the coding window because it is set slightly below the face of the mount, thus the mount is effectively much narrower at that point. When the light enters the interior the rays are projecting upwards so the sensor is hit at the top, or the opposite side that the leak originates (meaning you see the leak in the bottom of the final photograph). The problem is exaggerated with lenses that have a screw hole near the window or lenses that have a rebate in the mount to code the lens, such as Zeiss M lenses. 

It was first noticeable with the M9, then the same thing happened with the M240, and now the M10, and I think it's possibly even worse with the M10 because the code reading window appears to be wider. My solution is exactly the same as Neil's, a hair scrunchy slipped around the lens, but a lens cloth wrapped around the lens, or even a hand held near the camera can stop the leak. 

Edited November 3, 2018 by 250swb

[hteasley]

interesting. thanks for the info.

[MarkP]

Always carry a scrunchy for long daytime exposures. Really only a problem with direct sunlight on the lens mount.

 

 

KDR quoted me from an older and now inaccessable thread...

...and the rest of that (at times) somewhat acrimonious thread 🙂

 

Edited November 3, 2018 by MarkP

[Guest]

13 minutes ago, MarkP said:

Always carry a scrunchy for long daytime exposures. Really only a problem with direct sunlight on the lens mount.

 

 

KDR quoted me from an older and now inaccessable thread...

...and the rest of this (at times) somewhat acrimonious thread 🙂

 

Only if YOU want to make it like that

Neil

[MarkP]

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Neil you ding-bat.

I meant the old thread I referenced was acrimonious.  You were part of it and would remember that idiot 'engineer' who wouldn't listen to anything we said. You were equally shitty with him.

Regards,

Mark 🙂

[Guest]

5 minutes ago, MarkP said:

Neil you ding-bat.

I meant the old thread I referenced was acrimonious.  You were part of it and would remember that idiot 'engineer' who wouldn't listen to anything we said. You were equally shitty with him.

Regards,

Mark 🙂

Sorry Mark yes I remember.....the wine is nice though

Neil