IIIa exposure problem?

[garryleica]

Advertisement (gone after registration)

I've put a test roll through my IIIa, and in the brighter exposures can see what looks like a brighter patch just inside the frame of the picture.

The brighter area starts on one side, and looks like it tails off towards the other end of the frame.

Just realised that on the original negative, the area in question would be darker, not lighter.

Hopefully attached inverted, and non-inverted scans below.  They are oriented so you are looking at the emulsion side as it faces towards the back of the lens.

The picture was taken at f4 1/60

Any ideas what the problem might be?

Thanks.

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Edited June 28, 2022 by garryleica

[Advertisement]

The Leica Q3 is available for pre-order at B&H Photo Video and Adorama

[adan]

To me, that looks like flare from a bright area just outside the picture (to the left, in your posted images - maybe a window just outside of the frame?) bouncing off the inside of the camera in front of and around the shutter opening.

Keep in mind that the film sits in the back of a "shadow box" several mms deep behind the shutter opening - the edges of the picture area are shaded from such flare by the depth of the "box", and thus are not struck by the flare (and are darker).

Still happens even with today's digital Ms from time to time - both the internal camera flare, and the darker edge areas that are protected from the flare.

[garryleica]

Thanks for your answer, it makes sense.  I'll see if I can cause it deliberately on a couple of shots on my next roll, and see what happens.

[a.noctilux]

Adan's explanations here

 

another thread

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

from Adan's thread above link

Edited June 29, 2022 by a.noctilux

[garryleica]

Mystery solved, then!

I think it must have reflected off the 2nd curtain roller, as it sits out quite far into the lens mount opening.

Thank you both for the replies, and extra information.

Edited June 29, 2022 by garryleica