Re: web page, IR3D

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

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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