Re: Pressure plate static?

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

On 11 Oct 00 at 22:06, HypoBob wrote:

> > Kieth,
> 
> Heeger, MacDiarmid, and Shirakawa just won the Nobel prize in chemistry for solving
> this problem for us.
> 
> Well, not exactly, but their development of conductive plastics has led to a coating
> incorporated in photographic film to prevent static electricity from becoming part
> of our images.  I have never seen this promoted or claimed by any of the big film
> makers, so maybe it is only used in expensive, special purpose films.  On the other
> hand, I have often wondered how all these motorized cameras manage to rewind film so
> fast without any static electricity marks.  Possibly this Nobel-quality discovery
> explains it.

Actually, when shooting on very cold days, with inherently low humidity, 
one has a high chance of causing static discharges, visible on film.

However, this somehow seems to have a correlation with older
cameras; at least I never encountered any of that, not even at -20C
(and a high-speed EOS-1)....not sure why, perhaps coating on the
pressure-plate changed, or the conductivity of the entire structure
from pressure-plate to back to body (and film rails)
changed.....although one would expect that a full metal body does
better in this department than a modern camera....but one never
knows, R&D does wonders....







 

--                 
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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