[rollei_list] Re: Zeiss Ikoflex Lens Issue
- From: eroustom@xxxxxxxxxxx
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 29 Dec 2006 18:19:08 +0000
Richard, that's the generous spirit that defines the best of email user groups!
To check focus on a camera I was playing with, I took a clean thin sheet of
tracing paper and afixed in the place the film would be, with the back open -
with a towel over the back of the camera and my head, and the shutter locked
open (B and cable), I could see pretty much what the film would "see". Is there
a better, less silly way to do it?
Elias
-------------- Original message ----------------------
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> The lenses are simple Triplets. The end elements are
> strongly convex toward the outside and more weakly convex
> toward the stop. They are likely of different diameters with
> the larger being the front. The center element is harder
> because it is biconcave with nearly equal curvature on each
> side. However, the two curvatures are not the same. You may
> have to determine the correct direction experimentally. The
> difference in image quality is large and quite noticable.
> When facing the wrong way the image will be very blurred
> away from the center.
> Generally spacers are arranged with the sharp surface
> against the center lens.
---
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