[rollei_list] Re: Zeiss Ikoflex Lens Issue

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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