On Sat, Nov 20, 2010 at 4:54 PM, Larry Colen <l...@red4est.com> wrote: > > On Nov 20, 2010, at 1:47 PM, Charles Robinson wrote: > >> On Nov 20, 2010, at 15:24, Larry Colen wrote: >> >>> Thanks all for your comments. >>> >>> Ann, I did some pixel peeping on other photos in the set looking for >>> evidence of tripod shake. I think that one problem I'm having is >>> accurately focusing the 20/1.8 in the dark. I suspect that infinity is not >>> exactly infinity. On my cameras auto focus won't work in that light, and I >>> didn't bring my laser pointer. >>> >> >> This is going to sound odd, but the last time I did long exposures at night, >> I found that using the Live View was a great way to quickly get my little >> points of light in the distance to be as tiny (thus, in-focus) as possible >> with a minimum of fuss. > > I tried that, but couldn't see anything in live view, I'll have to try again > and see what it takes to get it to work.
It does work, but can be a pain. Getting the stars to points is probably the easiest, but for that shot I'd just set the lens to infinity and use DOF. > >> >> That and stopping down to f/8 or so. > > Good point, but I was already exposing at 30 seconds. > Bulb and a locking cable release, no reciprocity failure on digital so test exposure at 30s, stop-down and reshoot -Adam -- 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.
