Re: Darkloading

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

On  9 Aug 96 at 2:35, George L Smyth wrote:

> SHACKATTAK@xxxxxxx wrote:
> > 
> > Hi All,
> > 
> >     I have read somewere that if you would take a piece of undeveloped film
> > (print or slide, not IR) and attached it to the leader of the IR film then
> > roll it back into the film cataner that you will not fogg the front of the
> > film. 
> 
> Unfortunately, this will only "kinda" work.  There are two reasons for
> loading in total dark.  One is the lack on an anti-halation layer on the
> film.  The other is that the felt is not IR opaque.  So although it
> might help, I'm thinking you'll still get some fogging, depending upon
> the light circumstances.  Next month I buy the changing tent I should
> have had all along.

Aside from the hassle (and most modern cameras not going past 36 
frames....8-((....) I might work. Keep in mind that the both the 
IR-leaking felt and the lack of an anti-halation layer are neccessary 
to get the fogging in the first place; they are not independant 
fogging sources; if either problem would seize to exist, there would 
be not fogging so deep inside the film. So if you could roll 
sufficient length of normal film into the cassette (so that it covers 
the entire roll of film inside), you might tackle the fogging. 

The only problem I see: how on earth are you going to apply the tape 
in the dark? Tape only wouldn't be a problem, aligning the sprockets 
is horror....
I know one can use low intensity fluorescent light indoors to
prevent the fogging....but still....

My dream solution is also in the pre-loaded camera backs....for 70mm 
film that is....the cartridges take 4.5m film....ie 50-60 shots 
each....a few mag's should take you through the day....8-))
For 35mm a second hand Rollei 300x might come in handy....a pity they 
are not made any more....

--
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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End of INFRARED-PHOTOGRAPHY Digest 26
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