Wolfgg wrote
: Hello,
Place some aluminium foil inside the film chamber so that half the viewfinder is covered. Then use a magnifying glass to focus on the light-dark edge as sharply as possible. Now place the Paterson underneath; if you cannot focus on both the focusing bar and the edge of the foil at the same time, there is something wrong with the Paterson’s adjustment.
Does the Paterson perhaps also take the thickness of the photographic paper into account?
[...]
Yes, I’d already had a similar idea: to adjust it using an unexposed streak of film, into which I’d scratch a very small slit with a needle.
But I can already tell you that the bar will then be out of focus. There is already a misalignment of several millimetres at the eyepiece between ‘bar is in focus’ and ‘image is probably in focus’. If not even more than half a centimetre.
