>> If I use a true IR filter that lets in
>> no visible light, will the camera still
>> be able to focus on the IR spectrum?
> I'll try it tonight when I get home and
> let you know what happens. I bet it'll
> work.
I taped a small piece of 87C gel over the AF sensors
in the bottom of the F5's mirror box, and taped another
piece between the film rails inside the back (between
the shutter and the film), and loaded up a roll of Kodak
HIE.
It appears to be working. I haven't developed the film
yet, but the camera focuses approximately the right
amount in front of the visible light image.
I was using a 105mm/f2 DC to test it out. I figured
it's narrow depth of field would provide a good test
of focusing accuracy.
Even with an f2 lens, it takes a lot of IR to autofocus.
With the subject in direct sunlight it focused pretty
well, but any amount of cloud cover reduced the IR
enough to prevent the AF from working at all.
-Don
