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12-07-2014, 01:44 AM   #1
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K20 Problem

I gave my K20 to a friend, and a year later it has a problem. The viewfinder has a tunnel, and will not focus to infinity. LV seems to work OK on the kit lens, but not on primes. I'm thinking possibly she dropped it, although she says no. There are no marks on it. It will not autofocus using the viewfinder. Any ideas?

12-07-2014, 01:56 AM   #2
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I don't think there's any other way than to send it for a repair quote. Even if your friend has not dropped the camera, maybe someone else in the house has. It sounds like the pentaprism might have become dislodged, or perhaps the viewfinder optics displaced.
12-07-2014, 02:29 AM   #3
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Oh dear not sounding too good, time to visit the friendly Pentax repair person I think.
12-09-2014, 10:01 PM   #4
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Well, it did make a month-long stay in Peru. Lucky she even has it still!

12-13-2014, 12:40 AM   #5
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I suggest checking the focus screen is properly placed, seated and the holding frame properly closed. This problem seems to be caused by a misaligned or not properly seated focus screen. It could be from a strong whack or someone removed the screen for cleaning (or else) and couldn't place it back properly.

Check also viewfinder diopter correction. An over adjustment here can prevent you from focusing on anything.

Have in mind that tha AF SYSTEM works with sensors at the bottom of mirror box. The focus screen and viewfinder take no part in the AF, so if the camera says its in focus but at viewfinder "seems out of focus", the the issue relates to viewfinder part(s) out of proper position or alignment.
12-13-2014, 09:42 AM   #6
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QuoteOriginally posted by rburgoss Quote
I suggest checking the focus screen is properly placed, seated and the holding frame properly closed. This problem seems to be caused by a misaligned or not properly seated focus screen. It could be from a strong whack or someone removed the screen for cleaning (or else) and couldn't place it back properly.

Check also viewfinder diopter correction. An over adjustment here can prevent you from focusing on anything.

Have in mind that tha AF SYSTEM works with sensors at the bottom of mirror box. The focus screen and viewfinder take no part in the AF, so if the camera says its in focus but at viewfinder "seems out of focus", the the issue relates to viewfinder part(s) out of proper position or alignment.
I'll check the focus screen out, as I had changed it before she had the camera- thanks! However, I don't believe it is auto-focusing at all, except sometimes with the kit lens.
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