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6 Days Ago - 1 Like   #16
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You're welcome, Sooner Caniac!

I did come across this older thread on searching this forum: Random overexposure with K-3 and HD 16-85 - PentaxForums.com. Slightly different problem, I think, but the suggestions on this thread got me to try the contact cleaning fix and to play with the aperture control lever. I tried the contact cleaning fix with no luck. I tried the 16-85 on my K-S2. Same result as I got on my KP. Other lenses worked fine on my KP. I knew it had to be the lens, but it wasn't 'til I played with the aperture lever (to see if it was stiff or sticking, as suggested in the linked thread) that I discovered that it was completely loose, with no snappy, spring action at all. So, off it went. Have you checked your 16-85's aperture lever? Give that a test and see how it responds. The diaphragm should open up freely when you move the actuator and snap back on its own when you release it. Mine had lost that snap, which is what made me realize that there was indeed something wrong inside. If there is anything wrong with yours, getting it looked at professionally before it's out of warranty will be a lot cheaper! Mikesbike's suggestion is a good one.

6 Days Ago   #17
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Excellent advice Thagomizer and mikesbike; I love this community!

I didn't even think to check the aperture lever Thagomizer; I will do this when I get home from work. That thread you shared is extremely insightful as well; I sure hope it isn't my K-3 (sort of hoping I could hold out until the new body hits the streets). While I haven't noticed it on any other lens, since I purchased my 16-85mm it's on the K-3 the majority of the time so it may be hard for me to catch the problem with another lens if it is this random. I will start paying more attention for sure.

Mikesbike, yeah you are right, no visible dirt came off the contacts. Since Thagomizer mentioned it, I wonder if it wasn't cleaning the contacts that "fixed" the problem, but hitting the aperture lever while cleaning the contacts that "unstuck" it. I completely agree a call to Ricoh is in order. I'll try to keep this thread updated if I learn anything.

You guys rock!
6 Days Ago   #18
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always check the lever
6 Days Ago - 1 Like   #19
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QuoteOriginally posted by pschlute Quote
always check the lever
And don't cross the streams!

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