I've taken some photos with my old Zenit-B camera. And I have some strange white spot on all of the photos in the upper right corner. Sometimes it is not too recognizable, but it is everywhere.
It looks like condensate, but I can't see anything like that on the lenses when I open camera. Also it is quite strange that this spot even appeared on absolutely dark photo.
Does anybody know what could it be and how could it be fixed?
Answer
I would say light leakage and possibly internal reflections of some sort.
Considering you get a "bright patch" in the top right, I would highly suspect there is light leaking in.
The "dots" look a lot like reflections to me. In the lens, on a piece - anything that is shiny and reflects light.
I'd say start by checking whether the back closes properly. Next check if you have light leakage from the viewfinder.
Lastly, have a good look if you can see a reason for reflections in the camera.
If none of the three turn up something, try a different lens and see if the issue still occurs. If no, then it is the lens, otherwise... I'm out of ideas...
A last common option for failure would be the shutter, BUT that tends to look rather different.
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