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01-31-2013, 07:22 AM   #1
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[K20D] sensor shaking in bulb mode

Hi guys

Just took my camera out with a friend to do some bulb-exposure star trails, and to my embarassment, it didn't work properly. Thankfully, she also managed to mess up by bringing the wrong clip for the top of her tripod, but that's another story...

Anyway, during bulb mode, whilst holding the button down, the sensor shakes from side to side. It's noisy, and causes the entire camera to shake. It's very much like the cleaning function, but continuous for the entire time I try to take the photo. Obviously, it does the photo no favours.

I haven't noticed any other issues with the camera - normal exposure modes seem to work correctly.

I was set to f1.4, ISO 1600, using a 50mm prime lens in MF mode with the anti-shake turned off. I switched to a zoom lens, but it did the same thing. Removing and replacing the battery (as the manual suggests for odd issues) didn't solve the problem.

Any ideas? Factory reset? Time for a service? Time for a K30d?

Edit: I pulled the lens off to have a look - it's actually the sensor shaking, not the mirror flapping. Post updated to reflect this.


Last edited by Magilla; 01-31-2013 at 03:11 PM.
01-31-2013, 08:12 AM   #2
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Just out of curiosity, how many flaps per second does it go?
01-31-2013, 03:11 PM   #3
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It's about 4 times per second

Edit: I've now found that it also does it when you lift the mirror to use the LCD as a viewfinder.

Last edited by Magilla; 01-31-2013 at 03:18 PM.
02-05-2013, 08:45 PM   #4
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...SR was off... or did you switch the SR off while the camera was still powered on?

02-05-2013, 09:47 PM   #5
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I think I turned SR off while it was powered on, but I did reboot it after that...
02-06-2013, 09:58 AM   #6
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Well, I tried it with my K20D and could not simulated it. Does it do the same if you go from a manual lens to a DA lens?
02-06-2013, 03:18 PM   #7
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I don't have a manual lens at the moment, but it does it without a lens.
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