When I look through my Pentax K1000 with 55mm lens unless I am in pin sharp focus there is a rippling effect, what is it called and what causes it please? It's only in the centre of the viewfinder.
Not daft at all. It is a microprism on the screen that helps with focusing. Check out the photos on this Wiki page and it shows the dofference when in focus https://en.wikipedia.org/wiki/Focusing_screen
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