16.5" Red Dot Artar Coverage?

Was it on this list that someone recently inquired as to the coverage of a
16.5" Red Dot Artar? I have an old Scheider brochure that lists lens
coverage. Coverage for this lens is listed as 356mm at f16.

"Victor Loverro" wrote in message ...
Was it on this list that someone recently inquired as to the coverage of a
16.5" Red Dot Artar? I have an old Scheider brochure that lists lens
coverage. Coverage for this lens is listed as 356mm at f16.

Victor,

The reference I have lists the non-red dot 16 1/2 inch artar as 357 mm
and the red dot as 367 mm (original source unknown). An old scanned
Goerz product sheet lists 9x12 inches as the film size for the red dot
lens in shutter, and 18x22" as film size for in-barrel red dot lenses
at 1:1.

Steve

"Steve Hamley" wrote in message
om...
"Victor Loverro" wrote in
message ...
Was it on this list that someone recently inquired as to
the coverage of a
16.5" Red Dot Artar? I have an old Scheider brochure
that lists lens
coverage. Coverage for this lens is listed as 356mm at
f16.

Victor,

The reference I have lists the non-red dot 16 1/2 inch
artar as 357 mm
and the red dot as 367 mm (original source unknown). An
old scanned
Goerz product sheet lists 9x12 inches as the film size for
the red dot
lens in shutter, and 18x22" as film size for in-barrel red
dot lenses
at 1:1.

Steve

These are rather narrow coverage lenses. Typically, they
will cover from 45 to 48 degrees for best image quality but
for pictorial purposes at infinity focus will cover an image
circle about equal in diameter to the focal length. There is
a little coma at infinity focus but its gone at f/22.
In their intended use the image circle is, of course,
larger. At 1:1 any lens has double the diameter image circle
it has at infinity.


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Richard Knoppow
Los Angeles, CA, USA