Re: paper backing/halo (was: Out of date Konica 750 - 120 roll t

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

On 25 Jul 96 at 4:57, Hal wrote:

> By the way, no pinholes or fogging, except for fogging the last frame on one 
> roll that I did not roll tightly when removed from the camera, haven't done 
> that in a long time. (If Konica can make a light proof backing paper for IR, 
> Kodak could if they thought their was any money in it. 

Well....it might be more complicated than that. 

Someone posted about Kodak counting on a reflective film pressur
plate to get the famous halo effect (confirmed btw in an article in
Amateur Photographer (thanks Gareth!); the reason for the lack of an
antihalation layer seems to be that no dye can absorb light so far
into the IR spectrum). If one would add a paper back, it might show
the paper fibre on film. Just a wild guess, but it would probably
alter the halo effect we all love.

Actually, according to a fellow night vision nut: not all camera
pressure plates reflect the same amount of IR! One can see this with
those IR sensitive NV scopes, and there are noticeable differences between
camera brands. 

BTW, this article in Amateur photographer mentioned the dimpled
pressure plate of a Pentax K-1000 btw (so long for some of the good
old mechanical workhorses....;-)), according to the author it could
be solved by taping something on the pressure plate....he recommended
the paper backing of 120 roll film!
Either my above theory stinks, or this solution doesn't work....


--
Bye,

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The difference 
between men and boys
is the price of their toys

<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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Topic No. 12