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07-28-2007, 10:59 PM   #1
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K10D - drastic underexposure!!

OK, took the 135/2.5 and M42-Kmount adapter off yesterday & put the 16-45 on. Tried taking some photos. They initially were just dark, then went black - taking photos indoors & it wants a 1/1600s @ F10 exposure!!! Far out... it's on firmware 1.3 - the exposures had been good with the 135/2.5. What do I do? Thanks people...

07-29-2007, 12:20 AM   #2
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Get some lens cleaning solution and just give the contacts on both mounts a quick clean.
07-29-2007, 12:27 AM   #3
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Thanks... I'll have to get some. Is that a definite fix?
07-29-2007, 12:49 AM   #4
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NO, but is is what fixed my DS when the AE went on the blank.

07-29-2007, 06:27 PM   #5
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If after cleaning the lense, it still have problems, check if the aperture control on the lense is functioning. It is a little black metal lever on the back of the lense and it is spring loaded, moving it back and fore should see the aperture changes size and it always springs back to one position (either max or min aperture, I forget). I had to repair my 16-45mm when it somehow lost the spring. So all my pictures were under exposed.
07-30-2007, 05:43 PM   #6
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A second person has reported a very similar problem. See...

https://www.pentaxforums.com/forums/pentax-dslr-discussion/10137-auto-focus-l...work-k10d.html

Have you had any success in resolving this, SupremeMoFo? If so, you may want to let that person know what worked.

stewart
07-31-2007, 01:54 AM   #7
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any luck yet on fixing your problem. i posted the same problem on another thread and still waiting for a fix.
07-31-2007, 04:04 AM   #8
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No, haven't fixed it... I just tried my Sigma 70-200 as well - same problem. It's not the aperture opening either - the viewfinder is bright on both lenses. I even set the aperture ring on the Sigma to f2.8, and got the exact same exposure. I gave the contacts on both lenses and the body a wipe with a lens cleaning cloth, didn't help. I'll send Pentax an email.

So we've got the same problem with obviously different causes with a similar story leading up to it (firmware 1.30 and the manual lenses). Gahhhh.

07-31-2007, 11:50 PM   #9
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Got a call from CR Kennedy (Australian importer) today, left a message asking to call them back (not convenient). Waited til I got home - rang them - apparently, they go home at 4:30pm Melbourne time, and I rang at 4:40pm their time. Really helps with the shocking day I've already had.
08-02-2007, 04:12 PM   #10
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QuoteOriginally posted by SupremeMoFo Quote
No, haven't fixed it... I just tried my Sigma 70-200 as well - same problem. It's not the aperture opening either - the viewfinder is bright on both lenses. I even set the aperture ring on the Sigma to f2.8, and got the exact same exposure. I gave the contacts on both lenses and the body a wipe with a lens cleaning cloth, didn't help. I'll send Pentax an email.

So we've got the same problem with obviously different causes with a similar story leading up to it (firmware 1.30 and the manual lenses). Gahhhh.
In that case can I have your Sigma 70 - 200?
08-03-2007, 06:05 AM   #11
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If I was to sell it, at the current exchange rate, for me to justify that it would mean you pay as much, or more, than the lens cost new in the US.

Having fun getting hold of the importers about this after one initial phone call they made to me (which I wasn't able to answer)...
08-03-2007, 08:25 PM   #12
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QuoteOriginally posted by SupremeMoFo Quote
If I was to sell it, at the current exchange rate, for me to justify that it would mean you pay as much, or more, than the lens cost new in the US.

Having fun getting hold of the importers about this after one initial phone call they made to me (which I wasn't able to answer)...
Why do you need to get a hold of the importers? My USA Purchased GX-10 came with an international warranty the K10D might actually be the same.
08-03-2007, 09:10 PM   #13
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They're responsible for the servicing & warranty of it, as there's no actual Pentax Australia.

Got a reply this morning (a saturday) from an enquiry placed through their website, telling me to try setting it to ISO400. Lo & behold, it worked - exposures look fine now!! Such a damn simple fix...
08-04-2007, 12:24 AM   #14
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QuoteOriginally posted by SupremeMoFo Quote
Got a reply this morning (a saturday) from an enquiry placed through their website, telling me to try setting it to ISO400. Lo & behold, it worked - exposures look fine now!! Such a damn simple fix...
Eh??? But how it works at ISO100 now?
08-04-2007, 12:26 AM   #15
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QuoteOriginally posted by Ivan Glisin Quote
Eh??? But how it works at ISO100 now?
Well, that's just it - after setting it to 400, and getting the right exposures, tried 200 then 100 and they were both right too. So it's rectified simply by setting to ISO400 and taking a couple of snaps.
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