Re: web page, IR3D

[Richard Fung <rfung@xxxxxxxxxxxxxxxxxxx>]

Hi William,


I've sent you two messages off-line regarding your Colkin P filters but have
not heard back from you; out of courtesy, please email me back at
rfung@xxxxxxxxxxxxxxxxxxx


Thank you,

Richard

At 12:02 AM 1/28/98 +0000, you wrote:
>On 27 Jan 98 at 16:18, Glen Murray wrote:
>
>>    On opening the film can in the light- how much of the problem
>> is due to IR transmissive felt as opposed to light-piping film
>> base would be easy to find out, but everytime I've got the film,
>> I'd r ther shoot it than *try* to fog it  :)   If it is the lack of
>> halo backing, then light would be okay when downloading your film,
>> but not when loading it. 
>
>Light piping is as much a factor as the leaking felt.
>I once had films ruined because a stupid shop employee removed the
>cannisters long before development....so the felt does leak IR. 
>
>But if it had an anti-halation layer, the light would not have such
>an influence deep inside the cartridge. Note that this not
>necessarily means light *piping* (perpendicular to the direction of
>light)....the lack of this layer also makes it possible that light
>is transmitted straight through the emulsion (which also contributes
>to the fuzzy highlights by diffuse reflection of the pressure
>plate)....*both* these factors are most likely contributing to
>fogging. The 'cyclic' nature of fogging throughout the frame numbers 
>also supports this 'straight-through' effect, but OTOH it is unlikely 
>that it could have happened without some perpendicular light 
>piping....
>
>Hope this helps more than it confuses....;-))
>
>
>
>
>
>
>-- 
>Bye,
>
>Willem-Jan Markerink
>
>
>      The desire to understand 
>is sometimes far less intelligent than
>     the inability to understand
>
>
><w.j.markerink@xxxxx>
>[note: 'a-one' & 'en-el'!]
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>
Richard Fung
Planning, Evaluation & Information Systems
University of California, Berkeley
207 University Hall
Berkeley, CA 94720
(510) 642-1198

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