On Oct 11, 2010, at 3:49 PM, Matthew Hunt wrote: > On Mon, Oct 11, 2010 at 6:35 PM, Larry Colen <l...@red4est.com> wrote: > >> Alternatively, is there a good/easy/cheap way to stack a bunch of (for >> example >> 10 second) exposures to get a much longer exposure with less noise and short >> star trails? It would be preferable for me to do this in lightroom, but I >> also have >> photoshop. > > I don't think that's a winning strategy with film. To begin with, > there's the technical problem of registering the images for stacking, > since they won't inherently be in pixel-perfect alignment. I would > imagine that the same kinds of feature-matching programs that people > use for panoramas could help with this issue.
Sorry, I wasn't clear. Image stacking with digital is the alternative to using film. I know about reciprocity, but don't know specifically how to correct for it. With digital: longer exposures mean more noise With film: longer exposures mean you need to expose longer. Though, if it's a question of brightness rather than exposure period, maybe it'd be less of an issue with stars than it would be for the landscape. -- Larry Colen l...@red4est.com sent from i4est -- 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.
