Photo Techniques on WF Ektar

[T3D Peter Abrahams <telscope@xxxxxxxxxx>]

There is an article in Photo Techniques, Sept./Oct. 1997, which I believe
is the one that has been mentioned several times on this list.  It concerns
the Kodak 10" f.l. wide field commercial Ektar lens, a vintage lens of
mythic proportions.  This is a wide angle Gauss type of lens, for 8 x 10
exposures, and providing 80 degrees of coverage, comparable to a 35mm lens
on a 35mm camera.  They report that at f32 and f45, the lens is very sharp,
but it shows unacceptable spherical aberration at f11 and faster.  The
major problem they found was a serious flare in the exposures when the
light wasn't perfect, due partly to the 8 glass/air surfaces.  Stopped
down, given the right light, they reported it was as good as a modern lens.
  However, the modern lens was never worse and often better.  This was not
presented as an impartial, quantitative test.
_______________________________________
Peter Abrahams   telscope@xxxxxxxxxx
the history of the telescope, the microscope,
    and the prism binocular


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