Flat field of focus to be exact, which is a common design feature of macro lenses, not specific to bellows macros. What's unique about bellows macros is that they are short barrel lenses and require a bellows to hit infinity in most configurations.
Pentax made one, Nikon made a couple and Olympus made about 4, including a 20mm f2. -Adam On Fri, Jun 4, 2010 at 1:31 PM, Ken Waller <[email protected]> wrote: > What you really want is a lens optimized to have a flat depth of field. > Pentax made one - a 100mm for a screw mount. > > Kenneth Waller > http://www.pentaxphotogallery.com/kennethwaller > > ----- Original Message ----- From: "J.C. O'Connell" <[email protected]> > Subject: RE: Macro bellows: fifty bucks! > > > using a "regular" 50mm might work, but not as well > as a dedicated macro bellows lens will work. Another > low cost but high performance solution is to use a enlarging lens via > adapter. Those are similar to a macro bellows lens. > > -- > J.C. O'Connell (mailto:[email protected]) > Join the CD PLAYER & DISC Discussions : > http://tech.groups.yahoo.com/group/cdplayers/ > http://launch.groups.yahoo.com/group/cdsound/ > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Adam > Maas > Sent: Friday, June 04, 2010 12:53 PM > To: Pentax-Discuss Mail List > Subject: Re: Macro bellows: fifty bucks! > > > On Fri, Jun 4, 2010 at 11:34 AM, Bruce Walker <[email protected]> > wrote: >> >> Just had to share this apparent gem. >> >> Kirk Tuck in his blog points out a great macro bellows deal, a >> Fotodiox for $49.95 US at Amazon. >> >> He has tested it (on Canon) and found it to be as advertised, tough >> and accurate. >> >> Kirk's blog entry: http://is.gd/cCu8R >> >> A link to the Pentax flavour of it at Amazon.com is: >> http://is.gd/cCuc9 >> >> I think even I can afford this! The only showstopper for me is that >> my only macro lens is a DA Ltd and as such has no aperture ring. I'd >> have to try the reversing ring trick with my old SMC 50mm or rummage >> around for a deal on an old macro. >> >> Has anyone here tried one out by any chance? >> >> -bmw >> > > I haven't tried that particular one, but I've used bellows before. Note you > can use a regular 50mm on it, no need for a macro lens as the Bellows will > provide plenty of extension (my current bellows gets 2:1 magnification with > a 50mm lens). > > -- > M. Adam Maas > http://www.mawz.ca > Explorations of the City Around Us. > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
