GXR-M - Long Exposures - Avoiding Dark Frame Subtraction

Started Jun 4, 2012 | Discussions thread
Martin Setvak
Contributing MemberPosts: 500Gear list
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Re: GXR - Long Exposures - Dark Frame Subtraction - A16 unit
In reply to Helje, Jun 5, 2012

Helje wrote:

I have been working on a long exposure project ( http://www.flickr.com/photos/helje/sets/72157627933108519/ ) and found the dark frame subtraction that happens after every frame taken to be quite irritating. It adds a significant amount of waiting to each shot taken, as it takes about the same amount of time as the actual exposure.

After some experimenting, I have found a workaround by turning on the continuous shooting setting. This skips the dark frame subtraction step. However, one should only really use this trick in good light. In low light scenes, the hot pixels become too much of a nuisance.

I have not tried the trick with the 28mm module, but I assume it would also work there.

I hope this helps someone out there...

Very nice and interesting photos! As regards the dark frame subtraction (DFS), GXR with the A16 zoom unit applies it from 10-seconds exposure on; up to 8 seconds DFS is not applied, regardless of ISO settings. The interval mode has no impact on this; and yes, continuous mode suppresses DFS (but then the camera takes 3 raw images only before it stops to store the images and empty out its buffer). With the old GX100 the DFS is applied from 4 seconds on (without it up to 2 seconds).

Regards, Martin

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Martin Setvak
Kodak P880, Ricoh GX100 (2x), Ricoh GXR A16 24-85mm
http://www.setvak.cz/timelapse/

 Martin Setvak's gear list:Martin Setvak's gear list
Ricoh Caplio GX100 Ricoh GXR A16 24-85mm F3.5-5.5
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