re: Using 89B Infrared Filter with Regular B&W films

[<ray_ford@xxxxxxxxxxx> (Ray Ford)]

        Ilford has an extended red sensitivity film called SFX.  It's not a true 
IR film, but it might fit what your looking for. 

        I've never used an infrared filter,  but I have heard that they are 
opaque to visible light and transmit infrared.  If so, I don't believe you 
could shoot a panchromatic film through it.  Of course, the TTL metering 
would also fail, and many cameras default to using their longest available 
shutter speed.

        Good shooting.

Rpf
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Original Text
From: <infrared-photography@xxxxx>, on 10-Feb-97 18:34:
To: SMTP@xxxxxxxxxxx@Servers[<ray_ford@xxxxxxxxxxx>]

I tried taking some landscape shots the other day with a VERY dark red 
infrared
filter made by B+W.  I think it's equivalent to a Kodak Wratten 89B filter. 
I was using Tmax 400 film pushed one stop to 800. I was hoping to get an
almost black sky with very white clouds.
However when I developed the negatives the shots with the filter were not
exposed at all, and the negatives were completely clear.  
My guess is that Tmax 400 film isn't very sensitive to red light.  I'm pretty
sure that my camera (Nikon N90s) would correct for the filter factor via
throught he lens metering.
Can anyone reccomend a regular B&W film that could be used with this filter
to get unrealilistic contrast between the sky and clouds?  Or maybe my
technique needs improvement?
Thanks 
Peace Rolland Elliott  (rolland.elliott@xxxxxxxxx)


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