no, you specifically gave the magnifacation calcualtion as the size of the subject to the size of the format which is WRONG, its the size of the subject to the size of the subject's lens image, changing formats does not change this, and changing from APS to 35mm to Medium format or whatever, has no effect on the magnifcation calculation, format is not a factor, $ should not be considered...If you meant to say something else, you didnt. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Godfrey DiGiorgi Sent: Thursday, March 15, 2007 12:38 PM To: Pentax-Discuss Mail List Subject: Re: Macro Lenses The format is irrelevant to magnification. I was giving an example. If you understood what I said, you'd understand that it was the same thing ... said another way: - The size of the DSLR format is 16x24. If the magnification is 1:1, the size of the subject and the size of the format will be the same. So at 1:1 magnification, a Pentax DSLR will image a 16x24mm subject area. - The size of the 35mm format is 24x36. If the magnification is 1:1, the size of the subject and the size of the format will be the same. So at 1:1 magnification, a Pentax 35mm SLR will image a 24x36mm subject area. etc The key thing is that the number of pixels or the density of the film is irrelevant to magnification, which is what the example was attempting to show. G On Mar 15, 2007, at 3:16 AM, Mishka wrote: > absolutely correct. > > mishka > > On 3/15/07, J. C. O'Connell <[EMAIL PROTECTED]> wrote: >> NOPE, magnification in macro or actually any >> photo, macro or otherwise, is the ratio of the actual object size to >> the lens image size of that actual object, PHOTOGRAPHIC >> "FORMAT" IS >> NOT A FACTOR WHATSOEVER in the magnification expression or >> calculation ! >> ! ! >> jco >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >> Behalf Of >> Godfrey DiGiorgi >> Sent: Thursday, March 15, 2007 1:37 AM >> To: Pentax-Discuss Mail List >> Subject: Re: Macro Lenses >> >> >> Mishka, >> >> Magnification in macro work means the ratio of the size of the >> subject to the size of the format. 1:1 on a Pentax DSLR images a >> 16x24mm area. >> >> G >> >> On Mar 14, 2007, at 7:39 PM, Mishka wrote: >> >>> magnification on a digital sensor is a moot point anyway. how do you >>> measure it? suppose you have 24x36mm (FF) sensors: one is 2x2 pixels >>> and one is 20MP. does it make any sense to compare 1:1 mag images >>> made >> >>> on them? >>> >>> best, >>> mishka >>> >>> On 3/14/07, John Whittingham <[EMAIL PROTECTED]> wrote: >>>> >>>> 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. >> >> >> -- >> 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 >> > > -- > 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 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
