RE: HIE in a Canon T90

[Fadi makarem <Fmakarem@xxxxxx>]

Hi Ian,

	I have used the Canon T90 on many occasions with different types of
IR emulsions and had no problem of light leakage. Although I do cover the
film viewing window with a red sticky tape used to reseal a pocket tissue
pack. Since I carry a tissue pack with me the sealer came in handy. I donnot
know though if the seal is IR proof or the film viewing window. But you can
try to seal the window with some other tape or maybe the foam that surrounds
the window needs replacement.


FADI MAKAREM

> ----------
> From: 	Ian D Wilson[SMTP:idw@xxxxxxxxxxxxxxx]
> Sent: 	02 September 1998 14:28
> To: 	infrared@xxxxx
> Subject: 	HIE in a Canon T90
> 
> Does anyone else out there use HIE in a Canon T90?  Up to now, I have
> always used one of my (metal bodied) A1s for HIE, but I tried a roll
> recently in my T90.  There have been many messages to this list,
> dispelling the "urban myths" about polycarbonate-bodied cameras and film
> viewing windows; I was surprised, therefore, to find that the film had
> been fogged in a very consistent way.
> 
> Every frame has a vertical line of fogging about 1/3 of the way across,
> with a very sharp cut-off. The line is worse at one side of the frame
> than the other, but is it certainly present all the way across.  Given
> the anatomy of the T90, the light-trap of the film canister is just to
> the right of the viewing window (when viewed from the back).  My guess
> is that the viewing window leaks IR, and fogs the film which has just
> been unwound from the canister - in other words, the frame *before* the
> one which is being exposed.  (The sharp cut-off in the fogging must
> represent where the film disappears into the light-trap of the
> canister.)  Also, the amount of fogging appears to be dependent on two
> factors: (a) the brightness of the day during which the pictures were
> taken; and (b) the length of time between each frame.  Dull days and
> rapid firing seem to minimise the fogging.
> 
> Is this just my T90 which is playing up, or has anyone else seen the
> problem?  Until I can get it sorted, I guess I'll stick to my trusty
> A1s!
> 
> -- Ian.
> 
> --------------------------------------------------------------
> Dr Ian D. Wilson         |  Email:  iwilson@xxxxxxxxxxxxxxx
> Principal Engineer       |  WWW:    http://www.telemedia.co.uk
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