William wrote:
>"It could also be that the focus plane at the screen is different to the focus
>plane at the film, in this case you will not get optimally sharp results
>and the
>camera must be calibrated."
>
>A film-plane/focus-screen discrepancy will _not_ cause visible focusing errors
>_in the viewfinder_. The focusing screen doesn't "know" that the film is
>mispositioned.
I meant, it's possible that the lens at its infinity mark pictures objects
sharp which are in the infinity. And if the viewfinder shows such infinity
objects unsharp, there is possible a discrepancy between both distances. To
determine this, the user should make test pictures from infinity objects
with the lens set to the infinity mark.
Matthias
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