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07-04-2011, 03:12 PM   #1
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A few maintenance/repair questions

I recently inherited a Pentax 645 that's been sealed in a Tundra case since 1999 and have found 2 issues.

1) The filter ring on the 75mm lens looks like it got smacked - it's out of round in one spot. Barely. Just enough that a filter won't screw on. Can that be fixed and is it expensive?

2) There was a black speck in the viewfinder. I removed the lens and the spot was on the focusing screen. Figuring it was just dust I tried a brush on it. It smeared so it apparently wasn't dust. Grease? Most of it came off with lens cleaner & a microfiber cloth but there is some in the circular grooves (?) on the focusing screen. Is there something a little stronger I can use on the screen to remove the grease from the grooves without damaging the plastic? I'd rather not remove the screen if I don't have to.

Thank you,

Scott

07-04-2011, 06:13 PM   #2
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Yes on the Lens

Do a search here on PF, on lens filter ring repair from the home page. I had one that had a major dent and was able to fix it for nothing. There are a number of ways to do it. One suggests to cut out the dent out with a dremel tool. The other requires to cut out the size of the lens on a 2x4. Then using a dowl to gently pound it back into shape. I did the ground and pound and now I'm able to put a lens filter on it with no problem.
07-04-2011, 07:09 PM   #3
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The grease spot on the screen may be the remains of rotting foam seals. I'd take the camera in for a professional cleaning, just in case, before it spreads.
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