At 03:50 PM 8/1/2010, Elias_Roustom wrote:
>Thanks Marc,
>
>What is the significance of the APO designation. I see lots of
Rodagon
>lenses without the APO.
Sales hype among enlarging lens producers. All of them do this.
APO normally stands for "apochromatic", a lens which brings three
different frequencies of light to a common focus, and this normally
requires an additional element to accomplish this, or some really
exotic rare-earth glasses or the like. Enlarging lens manufacturers
simply produce a better grade of lens and call it APO even though it
is not an APO lens at all. JSK does the same, and Nikon has done so
in the past.
All of the upper end enlarging lenses are available rather
inexpensively used today -- I got my APO-Rodagons in box with caps
for $50 each about eight years back, and got a thank-you note from
one of the sellers for taking it off his hands. The exception are
the better Leitz enlarging lenses, which are being scarfed up by
collectors more than by users.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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