Re: Can the Ir get outside of the frame

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

On  1 Mar 99 at 16:46, Jim Bisnett wrote:

>     I shot my first Black and White IR film in 15 years. When I got it
> back I had bracked 1.5 stops from the exposure of my camera. I had a red
> filter on the lense of my Canon EOS 630. I did that just to make sure I
> got something. I was suprised to find that the least exposed was the
> only one that came out at all. I was also very suprised to see that on
> the very exposed frames there was no seperation between them. I mean
> that the IR must have bled between frames. Is this common if you over
> expose? I got a few good pictures and I hope to put up a limited web
> page in the next few days.

Forget your inboard light meter for the first few test rolls, start 
with a foolproof 1/250s @ f5.6-11 (using the Sunny Sixteen rule of 
1/ASA @ f16, based on #25-red => 50 ASA, and bright sunlight....with a
#87C infrared filter this becomes 12 ASA or 1/60s @ f5.6-11).
After that, you can calibrate your inboard meter by using this value 
as a reference....you will see that for your camera this equals 400 
ASA....since this is highly camera-depending, the Sunny Sixteen rule 
is much more foolproof for a start.






 

--                 
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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