On 7 Dec 2004 at 16:42, William Robb wrote: > It's just life with super wides on SLR cameras. > I just got some stuff done with my A15/3.5 which I shot at f/8, and > there are no corner sharpness issues with it, though wide open, it > isn't good. > My A20/2.8 is the same way. Not the sharpest in the corners wide > open, but very good down a stop or two, and excellent down another > couple of stops.
I'm in the midst of some tests designed to determine my lens distortions for inclusion in a great little shareware distortion correction package (and ps plugin too). I've shot the A16/2.8F, A15/3.5, A20/2.8, FA24/2, A24/2.8, Sigma A24/2.8 and FA31/1.8 wide open at f5.6 and f16 on a specific test target. From these tests I can honestly say that A20/2.8 is a little disappointing compared to the A24/2.8 and A15/3.5 for edge performance, the worst of the bunch in this area is the FA24/2, it made the Sigma look great. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
