On 27 Apr 2005 at 7:16, Shel Belinkoff wrote: > Isn't a macro lens designed for flat field work? If so, wouldn't a regular > lens > used with an extender, a bellows, or helicoil focusing device, be a better > choice for 3D objects, such as close-ups of flowers or small objects? Or > maybe > close-ups of not so small objects?
Yes, most dedicated macro lenses are flat field corrected. If the primary point of interest is in the centre of the frame you might get away with a non-macro lens pretty easily but the point is that the generally distorted plane of focus on the subject side of most non-macro lenses can become a problem at macro distances. It certainly would be no better for 3D objects, a flat field lens will generally record any object in close focus with less optical distortion. 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
