I have an 18" Wray APO process Lustrar which I was told by the
seller was sucessfully used for enlarging 10x8. When I was
researching the purchase I found this from Michael Gudzinowicz
on usenet:
From: bg174@FreeNet.Carleton.CA (Michael Gudzinowicz)
Newsgroups: rec.photo.equipment.large-format
Subject: Re: Wray Copy Lens
Date: 14 Mar 2000 15:16:46 GMT
Jess4203 wrote:
:-I saw a Wray 12" Copy Lens today very reasonable. Looked like
:-it might cover close to 90 degrees. Does anyone know if such
a
:-lens would be useable on 8x10,and/or as an enlarging lens for
:-8x10? For enlargements, I plan to do 11x14 to 16x20 prints
:-from 8x10.
Wray made a 6/2 wide angle copy lens (f/6.8) which was labeled
both as a "Copy" and "W. A. Copy" lens. The specs indicate 70
degree coverage, but older specs for another f/6.8 Wray 6/2
design,
indicate 90 degrees. That would be more or less consistent with
a Dagor clone. They also made a f/6.3 "Copy" lens which was a
4/4
design covering 60 degrees.
Any of those lenses in a 12" (305 mm) focal length should cover
8x10 (60 degrees = 354 mm IC) and you could use them as
enlarging
lenses. However, 12" is a bit long, and you might want to check
your enlarger's dimensions to see if it would work.
The carrier to easel distance required would be:
focal_length * (2 + 1/M + M)
where M is the negative to print magnification. For an 11x14,
you'd require 49.4"; for a 16x20, 54".
The bellows extension is focal_length * (1 + 1/M), or 20.6"
for the 11x14 and 18" for the 16x20.
Michael is one of those posters on usenet who gets his facts
right, so I don't think you'd have any problems using this lens.
For what it's worth, Wray was a premium U.K. lens maker, and
their longer process lenses are often bargains because people
don't recognise the name.
-- Struan Gray (struan.gray@sljus.lu.se), April 09, 2001.