On 10 Sep 2002 at 16:03, Fred wrote: > > A50 2.8 MACRO IS NOT A "NORMAL" LENS. > > > IT WILL NOT PERFORM AT INFINITY AS > > WELL AS THE OTHERS LISTED WILL. IT'S > > COMPROMISED AT INFINITY FOR BETTER > > CLOSEUP PERFORMANCE. > > I haven't found that to be true, JCO. My A 50/2.8 seems to do quite > well at infinity (at least up to a 5 x 7 - 13cm x 18cm - sized > print, which is the biggest photo taken near infinity with the > 50/2.8 that I can lay my hands on here right now).
I have also found that most macro lenses perform better at infinity, in fact MTF diagrams for many lenses will bear this out. I have the diagrams for some CZ lenses and my new APO 125f2.5 Lanthar. The lanthar MTF graphs cover infinity, 1m, 1:2 and 1:1 and the results are best at infinity and poorest at 1:1, this stands to reason as the image circle is being enlarged as the lens magnification is increased, ie it's moving further from the mount, so all errors are magnified. The SMCPA50f2.8 macro is a pretty nice little lens, if the FA version is better as is suggested I'd be pretty impressed. My selection would be the same as Freds for lenses of "normal" AOV ie 1 SMCPA50f1.2 2 SMCPA50f1.4 3 SMCPA50f2.8 Macro However my defacto standard lens has become the SMCPFA31f1.8 Ltd :-) Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications.html
