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12-27-2010, 11:48 PM   #1
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K200D photos oftern over/under exposed

I bought my Pentax K200D about 3 years ago and it has worked great. I use a 18-250 lense and rarely use the external flash AF-360FGZ.

Problem: In the last 6 months I can't figure out why my photos are often over or under exposed when taking shots indoors when using the internal flash.

Details:
- I have it set the dail to "AUTO PICT" and autofocus and I use the internal flash.
- If I attach the external flash AF-360FGZ then it works fine.
- I think the issue started when I played around with the external flash while connected to my K200D.
- I already tried to do a reset many times but does not help.
- I did a firmware upgrade from version 1.00 to version 1.01 but did not help.
- Earlier today I took my gear to a local store and they thought it was an issue with D-RANGE being enabled. I took their word and took my gear home. But when I tried it, the problem is still there (while I have the K200D set to AUTO 100-400; I get to this by Fn then ISO, FN , and then OK).

Any ideas?
Thanks!
Ian

---
Update: I added 3 photos. All were taken one after another without changing any settings. Dail set to AUTO PICT, Auto-Focus on, using internal flash.









Last edited by ian_mohammed; 12-28-2010 at 11:51 AM.
12-28-2010, 07:01 AM   #2
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It is hard to speculate what might be the problem, particularly if you are getting good results with the AF360. Could you post examples with the EXIF intact?
12-28-2010, 08:16 AM   #3
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A K-R will fix your problem. Not a stupid answer. I have a K200D and a 360 flash and have the same problem. After trying the flash on a new body, I noticed much better exposure using the flash. I think the problem is with the body, not the flash.
12-28-2010, 09:50 AM   #4
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The internal flash doesn't have a lot of power. Underexposure might be the flash firing at full strength but still not producing enough light. This is likely if you try to zoom farther than 50mm. It also sits low and the light can be blocked by longer lenses.

I have read that Auto ISO doesn't work well with flash. I didn't pay attention to the details because I never use Auto ISO. That might be a source of overexposure.

You might try sorting photos into three groups: overexposure, underexposure and good exposure. Then look at the data connected to each photo. My theories above can be checked - were all the overexposed photos taken at the upper ISO number? Or were underexposed photos taken at 100mm? If you can duplicate a scene with problems, like a photo in your house, you can set the camera up on a tripod and try to directly compare the internal flash with the AF-360FGZ.

12-28-2010, 11:52 AM   #5
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Update: I added 3 photos (see above). All were taken one after another without changing any settings. Dail set to AUTO PICT, Auto-Focus on, using internal flash.
12-28-2010, 01:49 PM - 1 Like   #6
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Almost looks like bracketing is on!
12-28-2010, 01:55 PM   #7
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That is just weird. I'd say the flash didn't fire in the first one. In the second one it went crazy, and the third one is about right.

I've never had anything like that happen with my K200D. Suspect it is malfunctioning, you may need to look into a repair.
12-28-2010, 02:06 PM   #8
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In time sequence:

Last one (taken before the other ones) is correctly exposed.

Second one overexposed; not sure why.

First one is probably underexposed because it was taken after the second one. Flash not fully charged yet might be an explanation; full batteries might help to bring the charge time down. It might also explain why the AF360 does not ahve the issue as it uses its own batteries.

Note 1:
there is a window that might reflect the light of the flash and influence the pTTL system; it might have saved you in the first shot (timewise);

Note 2:
You or the camera choose ISO 1600


Last edited by sterretje; 12-28-2010 at 02:12 PM.
12-28-2010, 05:37 PM   #9
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I agree it looks like bracketing is turned on with a wide exposure spread.
12-28-2010, 08:35 PM   #10
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It looks like bracketing but all three shots are at f5.6, 1/30s, ISO 1600.
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