On 10 Aug 2004 at 1:34, Anders Hultman wrote: > So, my question really is which of the two new Pentax macro lenses I > should get if I wanted the largest possible magnification. They're > both 1:1 but is it "the same 1:1" so to speak? I'm only used to using > the bellows, and with that it really is a difference between a 50mm > lens and a longer one.
1:1 means just that, a 5mm subject will be rendered 5mm on the 67/645/35mm/APS/*istD imaging surface. > With the bellows, the magnification setting effectively determines > the working distance. The DOF is extremely short, and I have to focus > by moving the whole camera back and forth. Practically working distance is tied with AOV, ie a short macro will give you more view of areas behind the subject, a long macro lens at the same film magnification will tend to isolate the subject to a greater extent. A longer working distance will allow you to light the subject artificially a little easier as equipment shadows are less likely. 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
