Possibly a stupid question.

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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.
 
I think what you are referring to is a microprism. It was an aid to finding accurate focus in the days of film SLRs.

Google microprism SLR focus and I'm sure it will be explained
 
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