It's a neat trick, I like it. One addition: I modify the low ISO setting to accommodate a maximum exposure length of between 2 and 4 minutes. This seems to make the best images for me, and fits within most of the SLR-class sensors' maximum exposure length restrictions, for those cameras I own that have them.
G On Sun, Dec 9, 2012 at 9:58 AM, Bob W <[email protected]> wrote: > That seems to make sense - 100:6400 = 1:60 as near as dammit > > B > >> -----Original Message----- >> From: PDML [mailto:[email protected]] On Behalf Of George Sinos >> Sent: 09 December 2012 17:35 >> To: Pentax-Discuss Mail List >> Subject: Long Exposure "Rule of Thumb" >> >> I was listening to one of the many photography podcasts recently and >> heard someone mention this estimating technique. >> >> He said he likes to make his night exposures at ISO 100 to minimize >> noise, but zeroing in on the exposure time at that low ISO can take a >> long time. >> >> So, he makes his initial exposures at ISO 6400. It turns out that the >> exposures length in seconds at 6400 is pretty close to the length in >> minutes at ISO 100. For example, a 10 second exposure at ISO 6400 >> would work out to a 10 minute exposure at ISO 100. >> >> Making the initial estimated exposure time at 6400 reduces the number >> of test exposures he needs to make at ISO 100. >> >> I had to make a little spreadsheet to convince myself. It's not exact, >> but the error is relatively small. Probably less than is necessary to >> give you a good starting point at the lower ISO. >> >> I don't do a lot of night or long exposure stuff and maybe this is >> common knowledge to those that do. I've been around a long time and >> heard a lot of "rules," but this one was new to me. >> >> gs >> >> George Sinos >> -------------------- >> [email protected] >> www.georgesphotos.net >> plus.georgesinos.com >> >> -- >> 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. > > > -- > 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. -- Godfrey godfreydigiorgi.posterous.com -- 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.
