> -----Original Message----- > From: george de fockert [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, September 10, 2002 4:24 PM > To: [EMAIL PROTECTED] > Subject: Re: Favourite K mount normal lens poll > > > > > > 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. > > > > JCO > > > > Macro lenses are generally not compromised at infinity, just for > having low > field curvature, also when used for closeup.
Conventional non IF lenses ( What I like to call TRUE MACRO) lenses ARE compromised at infinity. The article I just posted states they are optimized at 1:10, which means infinity IS compromised doesnt it??? > And in the case of the A50 2.8, it has a floating element, > probably to give > good results over the whole distance range. > They are definately designed to give best possible performance over a wide range of magnifications but as to whether they can match a true macro at the true macros optimum designed magnification is another matter. Sorta like the zoom vs. prime debate JCO
