Re: [OM] Gary's lens test... blur

[Winsor Crosby]

> On Wed, May 09, 2001 at 08:31:44AM -0400, JOHN SCHEUERER wrote:
> >  Sorry if this is way off base here,but here's an interesting article to
> >  check out on blur problems.Maybe someone out there can verify it in their
> >  own experience.
>
> The swiss magazin PHOTOGRAPHY (german language) reported problems like
> this when they tested the fast 1.2/50mm lenses. They blamed the design of the
> 35mm film patron, and demanded a redesign. The article was from 1981!
>
> The film gets buckled at the exit of the patron. The buckled part of 
> the film is located
> in the middle of the next frame (-> second frame problem). It occurs 
> always when the film
> is in the camera for a while without using, as he describes. Because 
> with the rtesting time
> the buckle gets harder in the film.
>
> regards ,
> Frieder Faig
I don't see how the film is buckled.  The slot on the film cassette 
is placed and angled so that the film goes straight from the outside 
of the roll inside through the slot without a bend. Possibly, if the 
camera is badly designed it will not hold the cassette in the correct 
position to feed straight to the film plane.  Allowing the cassette 
to rotate could possibly buckle the film. On an OM you can't close 
the camera back until the cassette is in the correct position with no 
crimp for the exiting film. I am more inclined to think it is a 
result of a badly designed motor drive system which requires a couple 
of frames before the film is correctly tensioned to hold it flat.
--
Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx

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