On 3 Apr 2005 at 23:26, [EMAIL PROTECTED] wrote: > Rod Opined: > > > > CA is visible to me and the the zoom appears pretty poor compared to the > > A20, > > Uh, the A20 wide open created nothing but useless mush. And it was only > mediocre > at the other stops. As far as CA is concerned, I can't see it, Herb can't see > it. It must not be very extreme, or perhaps it's a function of the monitors.
It's pretty plain to me on any of my monitors, CRT and TFT, I suspect that the comments in this thread are a good indication of why there are often such contradicting views expressed about the performance of particular lenses. It all comes down to different perceptions, to me the CA is irritating, it's something that I see and I know becomes apparent in large prints. For my direct visual analysis of the image presented on Josteins page I see the A20 at 2.8 as being low contrast not mushy, stopped down to f4 I expect it would be as contrasty as the DA. The DA is can see exhibits constant CA regardless of the shooting aperture, I'm talking about the obvious purple fringe. The A20 has some CA but it's pretty easy to eliminate with PS CS RAW. Cheers, 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
