On 21 Apr 2004 at 4:38, Steve Larson wrote: > Hi Kostas, > The reason a macro performs so well at close distances is that > the elements are designed to give a flat field, sharpness from > edge to edge.
Or put another way; most conventional lenses are designed to focus at a distance measured radially from the lens which isn't generally a problem for non-macro distances but is a right pain when trying to photograph flat objects. Older macro lenses were generally optimised for close working distances but from my experience many new lenses are fine performers at conventional shooting distances also. 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
