It's reasonable to consider reproduction ratios in approximately the 1:4 to 2:1 range as "macro" despite more specific definitions for photomacography and microphotography.
Most lenses marked as Macro achieve 1:4 to 1:2 magnification ratio without additional equipment. Some go to 1:1. For instance, the smc Pentax-A 50mm f/2.8 Macro is a superb performer and achieves infinity to 1:2 magnification without additional extension. Godfrey On Apr 29, 2007, at 8:10 PM, Adam Maas wrote: > Macro is in the 1:2 to 1:1 range. Your Tamron does 1:2 (half life- > size) > without the dedicated extension tube. > > Microphotography is greater than 1:1 magnification. But that generally > requires bellows or a reverse mounted lens on a macro lens rather than > just a macro lens. > > -Adam > > Jens Bladt wrote: >> I have photographed my Stanley measuring device with a >> Pentax K10D and a Tamron SP 2.5/90mm lens - at closest possible >> focusing >> distance; 0.39 m. Is this macro? >> http://www.flickr.com/photos/bladt/477746425/ >> >> Maybe not. My sensor is 23.5mm. This image covers appr. 47mm. This >> means >> it's almost accurately half natural size - 50% on the sensor. >> Isn't macro photography supposed to be enlarging the subject? >> On a computer screen my 3872 pixel would look like 1366 mm. That's an >> enlarement of appr. 2900% (almost 30 times). >> But enlarging the copies (negs) is not really macro, is it? -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
