Very interesting, and very well done. Dan Matyola http://www.pentaxphotogallery.com/danieljmatyola
On Wed, Jan 16, 2013 at 11:24 AM, wendy beard <pointyp...@gmail.com> wrote: > > Pretty neat abstracts! > > I must try and do some more macro photography. Some years ago I tried > some of a wafer, using the K10 and sigma 180mm macro plus extension > tubes. > > This is the wafer > http://www.pbase.com/wendybeard/image/111769543 > > and this is what I got > http://www.pbase.com/wendybeard/image/111757295 > and a crop of one of the die > http://www.pbase.com/wendybeard/image/111757296 > > Wendy > > On Tue, Jan 1, 2013 at 10:58 AM, Bruce Walker <bruce.wal...@gmail.com> wrote: > > Pretty cool, John. Ruler-wise you can't see the forest for the trees, > > but they yield very abstract, intriguing images. > > > > > > On Mon, Dec 31, 2012 at 9:40 PM, 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. > > > > > > > > -- > > -bmw > > > > -- > > 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. > > > > -- > Wendy Beard > Carp, Ontario > Canada > > -- > 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. -- 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.
