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05-27-2014, 06:57 AM   #1
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Aperture changes during exposure bracketing

Hi all,

I have recently found out that my K-30 changes both exposure time AND aperture when making bracketed shots. Is there any way to keep the aperture constant and change only the exposure time (other than to use M mode and change the time manually for each shot)?

Thanks,
Viktor

05-27-2014, 07:34 AM   #2
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Use Aperture Priority mode (Av).
05-27-2014, 07:47 AM   #3
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I use M mode to set the fixed exposure for panoramas. In Av mode the camera would measure light differently for every bracketed 3-tuple and I would get differently exposed shots in my panorama.
05-27-2014, 08:15 AM   #4
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Hugin — Stitching auto-exposed panoramas

05-27-2014, 08:46 AM   #5
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QuoteOriginally posted by viktorpus Quote
In Av mode the camera would measure light differently for every bracketed 3-tuple and I would get differently exposed shots in my panorama.
Welcome to the Pentax Forums!

In regards to the quoted text above, would this not be the case for any auto-metered mode? Your only options for keeping the aperture constant are M-mode, Av-mode, and TAv mode. It sounds like your use case is fairly specific. If you need identical exposures (same aperture, shutter, and ISO) for multiple bracket sets, you are limited to manually doing it in M mode.

User-defined bracketing is a cool idea, though.


Steve
05-27-2014, 02:53 PM - 1 Like   #6
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In my K20D and K-3 it's possible to get bracketing with constant aperture in M mode by setting the green button function in M mode to "Tv shift". It's undocumented but it works. Check if the K-30 has a similar customization setting.
05-27-2014, 05:50 PM   #7
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QuoteOriginally posted by markkuk Quote
In my K20D and K-3 it's possible to get bracketing with constant aperture in M mode by setting the green button function in M mode to "Tv shift". It's undocumented but it works. Check if the K-30 has a similar customization setting.
I just tried it on my K-3 and was astounded! What a cool feature! I do believe that it can be used for the OP's use case if supported on the K-30. Good work!


Steve
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