of course 1:1 or 1:2 is achieved at same distances, but the whole point of that paragraph of my post is you dont need 1:1 or 1:2 to get same photo as you would with 35mm, you only need 1:1.5 or 1:3 so your working distance is longer by approx 50% for same type of photo (same object/framing), this is the very reason why a 50mm lens on APS is good for general purpose macro, it gives a better working distance than was possible with FF 35mm format, yet still gives a reasonably normal AOV.
yes for some weird technical reason you might still want 1:1 on APS as you did on FF 35mm film, but its not real world and since digital is not an actual negative and isnt something you could actually measure and analyze like you could a real neg, I really dont think there would be much need to have an actual 1:1 vs a 1:1.5 digital for example even for technical reasons. Real world is going to be 99%+ an actual scene or object with same framing/AOV is needed, NOT same image magnification needed. jco -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Whittingham Sent: Wednesday, March 14, 2007 5:42 PM To: Pentax-Discuss Mail List Subject: RE: Macro Lenses On Wed, 14 Mar 2007 16:58:01 -0400, J. C. O'Connell wrote > Regarding working distances, the 50mm f.l. > ON APS gives much better working distances > than it did on on 35mm FF format for same > subject framing. This is because you dont > have to get as close (or need as high a magnification) to fill the > frame on APS as you did on FF 35mm. But you still have to be at the same distance to achieve 1:1 or 1:2 as the case may be, fact! Again depends on the subject matter and whether you require a particular ratio for scientific or technical reasons. John ------------------------------------------------------------------------ ---------------------------- The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. ------------------------------------------------------------------------ ---------------------------- -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
