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Re: [OM] Lens element groups

Subject: Re: [OM] Lens element groups
From: John and Julie Ockman <jrockman@xxxxxxxxxxxx>
Date: Thu, 21 Mar 2002 21:09:51 -0500
Wayne,
 I am not sure about all separations, but an 85-250 Zuiko I just bought
has separation in the the second element from the front, and it gives me
no end of flare. This separation extends about 1/2in into the elements.
I also do some large format, and only use old glass. I have had only
minor problems with stray light on these old lenses if the separation is
only 1/8in into the glass, even if it is all the way around. YMMV.
John

Wayne Harridge wrote:
> 
> > Paul Farrar <farrar@xxxxxxxxxxxx> wrote:
> >
> 
> ...stuff about cemented elements in a group...
> 
> I have a lens (not Zuiko !) which appears to have some separation of a 
> cemented
> group, shows some coloured interference fringes.  What is likely to be the 
> effect
> of this separation on the resultant images ?  As yet I have not had a chance 
> to
> test this lens and look at the results and don't have a good example to 
> compare it
> with anyhow.
> 
> Wayne Harridge


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