Light leak on long exposures?

[retcheto]

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I have a monochrom M246 and it seems perfect to me. The only issue I'm having is with long exposures, say 8 seconds +.

 

When I turn the camera to a vertical configuraion, I get a splotch of what looks like an inner reflection of light perhaps? I haven't done enough tests to see if this happens in a horizontal orientation, but I'm usually photographing landscapes so maybe I don't notice it because it's a white sky. 

 

This happens regardless of what ND filters I use. I don't have any problems with normal photographs, only very long exposures. 

 

Anyone else seen something like this? Attached is an example (unprocessed)

 

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[retcheto]

Here's another shot that shows the same patch of light in the lower left

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[LocalHero1953]

There have been a few posts in the past about light leak around the M mount during long exposures. I can't remember if they were as short as 8 secs.

The solution was to place a wide rubber band around the mount, or a child's elasticated hair band (google 'scrunchy').

[retcheto]

Thanks I forgot the cardinal rule of posting...search the forum first! 

 

I'll try what you suggest and see if that fixes it, thanks!

[DirkR440]

I help you a bit with searching :-)

 

https://www.l-camera-forum.com/topic/212964-monochrom-long-exposure-issue/

[brill64]

It's light leaking in through the lens mount & yes a rubber hair band solves it.