Originally posted by photoptimist Each of the causes
1) A misaligned mirror will have the largest effect on infinity focus at the top of the frame (and almost not effect on infinity focus at the bottom of the frame).
2) A mis-installed focusing screen affects infinity focus across the entire frame by the same amount.
3) Damage to the lens mount or body can affect infinity focus across the frame but is likely to be worse on one side or one corner versus the other.
Note: if you check infinity focus with small piece ground glass sitting flat on the film rails, then causes #1 and #2 will show a discrepancy between focus on the film plane versus focus in the viewfinder. Cause #3 will also affect infinity focus at the film plane.
Thanks everyone for your comments!
Taking into account the above, it seems like a misaligned mirror since the bottom of the frame looks to be more in focus than the top.
I’ll be sending it over to Cor van den Haspel from
http://www.camerareparatie.nl
He came highly recommended by my local camera shop, and did a fabulous job on restoring my Spotmatic II. Even changing out the entire prism at no extra cost.
I feared he completely stopped work on analog cameras since it took so for him to respond, but he just quoted me €45 to alleviate the problem and check if any additional work needs to be done before sending it back over.
Looking forward to having my Pentax LX in perfect working order. It looks to be in perfect condition concerning everything else. Even still had the protective foil on the bottom plate!
Thanks again to everyone who responded!
J.S.