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[OM] Re: ( OM) Photographs of lens damage

Subject: [OM] Re: ( OM) Photographs of lens damage
From: "Allan Mee" <bigalsgroups@xxxxxxxxxxx>
Date: Sat, 04 Nov 2006 22:05:47 +0000
You're probably right there.
Allan

PS No trees were harmed in the sending of this message and a very large 
number of electrons were asked their permission to be terribly 
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Disrupting the unnatural balance that you, as a conscious human being and a 
confused mass of energy, have created.
-Disturb the mind -




>From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
>Reply-To: olympus@xxxxxxxxxx
>To: olympus@xxxxxxxxxx
>Subject: [OM] Re: ( OM) Photographs of lens damage
>Date: Sat, 04 Nov 2006 16:16:49 -0500
>
>But filling the voids with black ink will obviate any light rays
>entering those voids from trying to reach the film plane at all.  There
>will be some loss of light and some diffraction around the edges of the
>voids but that will be much less worse than allowing the light to be
>scattered by that mess back there.
>
>Chuck Norcutt
>
>Allan Mee wrote:
>
> > I agree aboiut through the lens - but exiting the rear glass - the 
>distance
> > from it to the film lens will be a big factor in how far light deviates 
>from
> > the expected path. I'd do a test shoot (at all apertures) - its the only 
>way
> > to determine how bad the damage actually is. I'm just saying wont be as 
>bad
> > as if the pits were on the front glass (imo).
> > Allan
> >
> >
> >
> > PS No trees were harmed in the sending of this message and a very large
> > number of electrons were asked their permission to be terribly
> > inconvenienced. (And threw a party for them afterwards for being really 
>cool
> > about it).
> >
> > Disrupting the unnatural balance that you, as a conscious human being 
>and a
> > confused mass of energy, have created.
> > -Disturb the mind -
> >
> >
> >
> >
> >
> >>From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
> >>Reply-To: olympus@xxxxxxxxxx
> >>To: olympus@xxxxxxxxxx
> >>Subject: [OM] Re: ( OM) Photographs of lens damage
> >>Date: Sat, 04 Nov 2006 12:08:04 -0500
> >>
> >>I don't think your geometric diagram has much bearing on the actual
> >>optical path through the lens or the apparent angles to the film plane
> >
> >>from any given element, especially with severely retrofocus lenses such
> >
> >>as the 21mm.
> >>
> >>Chuck Norcutt
> >>
> >>
> >>Allan Mee wrote:
> >>
> >>
> >>
> >>>If a vertical line were the proper path, you can see that a scratch on
> >>
> >>the
> >>
> >>>front of the lens would mean a larger displacement from the proper path
> >>
> >>by
> >>
> >>>the time it reached the rear of the lens. But from the rear of the lens
> >>
> >>to
> >>
> >>>the 'film plane' may be small enough that the light path hasn't 
>deviated
> >>
> >>by
> >>
> >>>much.
> >>
> >>
> >>
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