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

Subject: [OM] Re: ( OM) Photographs of lens damage
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
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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