On 14 Aug 2002 at 10:16, Keith Whaley wrote: > Thank you Rob. May I then assume the true macro has a limited range, > and will not go to infinity? > I have used ordinary lenses that incorporate the lens motion to > encompass a macro range, and do rather well, but have never owned a > true macro lens. > For me that would be an excess, as the poor thing would sit idle for > weeks at a time. <g>
Hi Keith, I haven't owned a dedicated Macro lens that won't focus to infinity and most seem to be better performers at infinity when compared to non-Macro lenses of similar focal length and speed. However I would assume that most are performance optimised for close distances much some like enlarging lenses are optimised for a limited range of working distances or magnifications. Unfortunately Pentax provides very little technical information on its lenses, if you are interested comparing lenses the Carl Zeiss site has detailed down- loadable pdfs for each of its Contax SLR lenses. The pdf files for the macro lenses are quite detailed and provide MTF curves for infinity and closer magnifications. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications.html - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
