On Oct 14, 2011, at 2:04 PM, Matthew Hunt wrote: > On Fri, Oct 14, 2011 at 4:51 PM, Bruce Walker <[email protected]> wrote: > >>> It occurs to me that this will be a lot more difficult with K20D because >>> you can't turn off the long exposure noise reduction. How are you going to >>> get contiguous star trails? >>> >>> Or has anyone come up with a hack that will allow the K20D's long exposure >>> noise reduction to be turned off? >> >> Don't you just wait for twice the exposure time for the final result? I >> haven't tried star trails. My longest K20D exposure has been something like >> 5 minutes. > > Star trails from DSLRs are usually assembled from multiple exposures > (otherwise you build up too much background from dark current and sky > brightness). So if the noise reduction makes you do 5 minutes on the > sky, then 5 minutes dark, then 5 sky, 5 dark, etc., you'll have > interruptions in your star trails, and the combined result will look > like dashed lines.
You could always adjust the times of the exposures so that the star trails spell things out in morse code. > -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
