On Tue, Nov 24, 2009 at 09:39:07AM +0100, Thibouille wrote: > Larry, Sigma produces 20,24 and 28mm 'macro' Full frame lenses. All > are all f/1.8 and have an aperture ring :) > I can post some pictures if you want, taken with the 28/1.8. The nice > things about those is the very very close focussing distance (hence > 'macro') which combined with the f/1.8 renders some very interesting > DOF effects.
Very interesting, as in paper thin? > I wouldn't call those sharpest lenses ever produced wide open tough. I see myself having two uses for the 20/1.8. The first is indoor dance photography. The lighting tends to be very challenging, i.e. ISO 3200, 1/6 - 1/20 second at f/1.8, with the subjects moving. I suspect that in those conditions a little softness in the lens may not be noticed. I've also been doing some landscape work, particularly nightscapes. Exposures tend to be ISO 400, f/1.8 and 10-30 seconds. My 18-250 simply isn't fast enough to get much good shots, especially at ISO 400 (cue snickering by Dave Savage). Would you guess that the lens would not be the significant weak link in those situations? How sharp is it at f/2.8 or 3.5? At 3.5 is it noticably worse than the 18-55 AL or the 18-250 at 20mm? At times like this, I envy the Canikon crowd, because one of them could probably find someone locally that had the lenses and try them out. -- The first step is learning to take great photos, the second step is learning to throw away ones that are merely good. Larry Colen [email protected] http://www.red4est.com/lrc -- 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.
