Jens Bladt <[EMAIL PROTECTED]> wrote: > Did you really expose 15 minutes?
Sure. Mind you, 30 secs or a minute at f8 (my usual values with 35 mm or 6 x 6 cm) wouldn't sound extreme given the illumination (or rather the lack of it) at this scene. Now, these large formats with their long lenses require much smaller apertures than, say, 35 mm to get the same DOF and in this special case to achieve decent quality in the far corners of the negative which is already pushing things a little at 6x17 and a 4x5 inch lens with an image circle of some 220 mm. So, stop down to f22, add a mere 50 to 100 percent for reciprocity failure and those 15 minutes are really at the short end of things. If I were to repeat this shot, I'd rather do it with 30 minutes. All this is a new world to me as well. I'm just learning that even in bright daylight I'm shooting at 1/15 sec, enough to cause motion blur with things as slow as the coal barges on the river Meuse. Ralf -- Ralf R. Radermacher - DL9KCG - Köln/Cologne, Germany private homepage: http://www.fotoralf.de manual cameras and photo galleries - updated Jan. 10, 2005 Contarex - Kiev 60 - Horizon 202 - P6 mount lenses -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
