Archived posting to the Leica Users Group, 2015/08/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Yeah, I've seen the 500/F rule but I think it may be a little outdated because our sensors days still bloom when a point of light is surrounded by dark. Like the sensors are just a little too good and sensitive for the film rules like that mentioned. Film doesn't bloom or "leak" like a digital sensor can, when it comes to points of light so I'd say unless using a top shelf, large pixel (D4, D3, D2Hs) camera (though your tradeoff is resolution) then we're better off halving that rule so a 50mm lens is good with 5 or 6 seconds. With my 85mm f/1.4 I can't do any longer than 2 seconds without seeing drag. Phil Forrest On Tue, 18 Aug 2015 12:27:25 -0700 Adam Bridge <abridge at mac.com> wrote: > In ?Sky and Telescope??s most recent issue there?s an article on > shooting landscapes and starry skies. They gave a thumb rule I?ve > never known: > > The max exposure time is (500 / lens focal length in mm) to minimize > star trails. > > So for a 50mm lens it?s (500 / 50) = 10 seconds. > > It?s an interesting article with a follow up next month. > > Adam Bridge > > > On 2015 Aug 18, at 12:11 PM, Philip Forrest > > <photo.forrest1 at gmail.com> wrote: > > > > The star images have a small amount of drag from the rotation of the > > earth due to my shooting on a static tripod. I've since made a hinge > > tracker and might be able to capture some better images tonight at > > lower ISO, longer exposure with less or no drag, if the wind isn't > > too high. > > > > Thanks all, > > Phil Forrest > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information -- philipforrestphoto.wordpress.com gallery.leica-users.org/v/philforrest