Re: Can the Ir get outside of the frame

["Eugenie Beuman" <elbeuman@xxxxxxxxxx>]

-----Oorspronkelijk bericht-----
Van: Jim Bisnett <jtbisnett@xxxxxxxxxxxxxxxx>
Aan: infrared@xxxxx <infrared@xxxxx>
Datum: dinsdag 2 maart 1999 0:37
Onderwerp: Can the Ir get outside of the frame


>    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.
>
>
>       Jim
>
>*
>*Groetens from Holland, Jim!
     And hi to all of the rest of you out there as well. I'm Clark the
displaced Canadian who found love on the internet and so now here I am
living in Holland (yes it really does happen, and we're not all THAT crazy,
at least we've not been formally diagnosed as being such!)
    Anyways, I've been lurking for a bit on the Digest and have been mostly
sitting on the fence and watching the banter zipping back and forth. You, my
friend, are over exposing your film. Yes, it is very typical of HIE
(Infrared) to bleed like crazy if you overexpose it by a couple stops or
more, especially in your highlights. I realize you know this already. The
reason for this is that you are not using the proper film speed with that
filter of yours IF you are trying to meter TTL. I recommend slapping another
roll into that camera of yours and provided you are using a 25 red, use an
ASA of 800.  Now, meter through that filter, but take your reading from
tones that are within the panchromatic domain of middle gray, like grass or
foliage. Then, it would be wise to bracket and keep track of your exposures
for future reference. Also, I have found that this especially works well if
you also  make a note for each and every frame what part of the scene you
metered that determined your exposure. Then bracket a stop or 1.5 stops from
there. Do this exercise once on a bright, sunny day and again on an overcast
day. You will see that there is a big difference between these two rolls of
film, especially in the way contrast.
    Development is another big consideration in delivering an acceptable
latent image to the light table. With the film speed I suggested above, I
also recommend using D-76 straight up at 68 F for 11 minutes as a starting
point. Be careful with your agitation, especially if your film was exposed
under bright conditions. It is better to gently agitate perhaps 3 or 4
inversions every 30 seconds. I am more than certain that you will see a
remakable difference for the better in the quality of your results. If you
don't, then I will return (with my tail between my legs, no less) to the
lacklustre existence of LURKEDOM.
Cheers!
Clark -The Great Canadain Beaver Trap Thief- Reid


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