Paul wrote:
>>You might try a reversed enlarger lens. They are optimised for this
range.<<
Many enlarger lenses are symmetrical designs especially the 4 element units
that are readily
available inexpensively. So they work very well without reversal. Some of the
top end Schneider's
and Rodenstock's are not quite as symmetrical. I use a 28mm Cannon micro lens
(up to 8x)converted
to OM for micro work, but I usually use a 50 or 80mm enlarger lens for macro
work at around 1:1.
The enlarger lenses are really good see for example the MTF curves for the
common Rodagon 50mm
f2.8 at http://www.butzi.net/rodenstock/rodagon/50mm.htm. Stopped down to 5.6
this is a very good
macro lens. The distortion is much lower than most normal camera
lenses(~0.05%). Rodenstock
actually recommends the Rodagons for macro use without reversal and even
provides accessories see
http://www.butzi.net/rodenstock/rodagon/page5.htm. see also Edmund Scientific
http://www.edmundoptics.com/IOD/DisplayProduct.cfm?productid=1416 who supplies
them for scientific
use. Cost new for say a 50mm Rodagon is prohibitive ($260) but used prices can
often be in the
$30-$50.
I recently bought a Rodenstock Rodagon 135mm enlarging lens (MSRP $700 )in need
of cleaning, in a
lot with a lower end Rodenstock rogonar-S 50mm (4 element lens) and 3 rogonar
process lenses plus
some shutters for $39 off ebay. Avoid the really low end 3 element enlarger
lenses like the plain
Rogonars or their oem equivalents shipped as starter kit with enlargers.
Regards,
Tim Hughes
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