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. I wouldn't call those sharpest lenses ever produced wide open tough.
On Tue, Nov 24, 2009 at 8:40 AM, Larry Colen <l...@red4est.com> wrote: > On Mon, Nov 23, 2009 at 11:05:33PM -0600, Thomas Cakalic wrote: >> Not arguing or being argumentative, but if one already has two zooms >> that start at 18mm, then buying additional zooms that have a wide >> limit of 1 or 2 mm more is not getting him much, maybe a little speed, > > In theory, the 16-50 is a lot sharper than my 18-250, which is sharper > than my 18-55. It's also about 2/3 stop faster (3.5 vs 2.8). > >> depending on the lens. However, if the intent in purchasing is to use >> it mainly as a wide angle, then a fast prime makes more sense in my >> book, but then I'm not spending the money. > > I do like "fast primes", and that's what I mostly shoot with. However > until Boris mentioned the Sigma 20/1.8 I didn't know of much that was > wider than 30 and faster than 2.8. > > >From what I hear, the 16-50 is as sharp as a prime, and apart from the > sigma mentioned above, as fast as anything shorter than 30mm. The > weather sealing is also a big plus. > >> >> I hear "plenty fast" and things like that. How fast a lens is and >> whether it's speed is satisfactory is dependent largely on shooting >> conditions, is it not? I'd want the fastest lens >> available/affordable, because just when you think your lense is fast >> enough, it's not. > > If f/3.5 were fast enough at 18, I could get by with the 18-250, > despite it's lack of sharpness, which isn't really that bad for a lot > of work. But, I keep wanting something faster than it, especially for > night photography. > > > -- > The first step is learning to take great photos, > the second step is learning to throw away ones that are merely good. > Larry Colen l...@red4est.com http://www.red4est.com/lrc > > > -- > 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. > -- Thibault Massart aka Thibouille/Thibs ---------------------- Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, DA50-135, DA50-200, 360FGZ ... Laptop: Macbook 13" Unibody SnowLeo/Win7 Programing: Delphi 2009 -- 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.
