To All, With everyone's input the issue of sharp focus and some of the exposure time issues appear to be resolved (thanks again to the community at large). The perplexing thing I'm trying to figure out now is that of "Flats" and "Bias" frames. I think that dark frames are fairly straight forward (cover the scope and shoot a frame using the same exposure, etc. and make at least three). But as for "Flats" what is the easiest / best method to do so? Do you make "Bias" frames at the same time or at the time your making dark frames? Anyone have a little insight or direction here? Jimmy Ray -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.