On Mon, Sep 13, 2010 at 8:07 AM, Boris Liberman <bori...@gmail.com> wrote:
> Right. The particular DFS frame may depend on the outside temperature. So > yes, for perfect DFS, the procedure will have to be done every night. But > only once for the night. It actually depends more on the sensor temperature than the outside temperature, and the sensor will likely warm up as it and the other electronics are used. I'm not sure how much that matters in practice. What you really want to do for the best image quality is to take multiple dark frames and average them, and use that as the basis for dark subtraction. If you only have a single dark frame, it will remove the repeatable structure of the dark current, but it will increase the true dark-current noise (the non-repeatable, unpredictable component) by a factor of sqrt(2). Averaging several dark frames mitigates this effect. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
