I'm glad I'm not the only one who photographs rulers. My maximum set up covers 1 x 1.5 mm using an Olympus 20 mm macro lens on bellows. The trouble is that anything more than f11 and it goes completely soft, anything less and the depth of field is nothing (It's next to nothing at f11, but better than nothing).
It does give me images like this one though. http://www.bluering.org.au/leon/pictures/2008KittyMillerBay5510.jpg (Close up of the tentacles of a stauromedusa - stalked jellyfish) Super crazy macro is always fun. My latest challenge is photographing closeups of the heads of 15mm long live marine nemertean worms (in sea water) for my wife's studies and upcoming papers. (Worms move very quick!) Still it means she supports all my gear purchases :) Leon On 1 January 2013 13:40, John Celio <neo.venator.com+p...@gmail.com> wrote: > I shot a couple photos of a metric ruler just now. For anyone > wondering what the magnification of that super-crazy macro setup of > mine can do, here they are: > > http://www.flickr.com/photos/26065300@N00/8332245842/ > Pentax FA 50mm f1.4 (at f5.6) reverse mounted on my pile o' extension > tubes. Field of view is a bit more than 4mm. Let's play it safe and > say 4.2mm. > If I've done the math correctly (K-5 sensor is 23.4mm wide), this > means it has a magnification ratio of 5.57:1 > > http://www.flickr.com/photos/26065300@N00/8331187951/ > Cosina 28mm, same setup as above. FoV is a bit more than 2mm. I'm > guessing 2.2mm. > Again, if my math is right, magnification ratio of 10.6:1 > > Wow! > > The 50mm seems to produce somewhat sharper images, so I'll probably > use that lens for this sort of stuff until I find a really, really > (really) good 28mm lens someday. Magnification like this needs > something sharp as a razor, apparently! > > John -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
