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mopar_guy · Posted: Sun Oct 24, 2010 12:16 am Post subject: Rollfilm holder for infrared?

I have several 2x3 Pacemaker Speeds and Crowns and knobwind "23 Graphic" rollfilm holders. I was thinking of trying of trying some of the Rollei 400 IR film in 120 and was wondering if they would be "safe" for infrared.

Dave

Henry · Posted: Sun Oct 24, 2010 5:02 pm Post subject:

Well, if you can shoot 35mm IR film in a regular ol' 35mm camera, I don't see why you could not shoot 120 IR film in a roll film holder on a Graflex/Graphic camera. Or am I missing something here? I believe I remember something about having to use a red filter when shooting IR. Others please chime in here. Disclaimer: I have never shot IR film.

Dan Fromm · Joined: 14 May 2001 Posts: 2159 Location: New Jersey

The plastic darkslides may not be opaque to IR, Henry.

FWIW, my SubSea/Graflex RH-8 has a stainless steel darkslide.

mopar_guy · Posted: Sun Oct 24, 2010 5:32 pm Post subject:

The darkslides look to be made of plastic.

Les · Joined: 09 May 2001 Posts: 2682 Location: Detroit, MI

the darkslides are made of the same (plastic) material all of the other IR safe film holders are, so they should be safe. Now the roll holder body itself??????
_________________
"In order to invent, you need a good imagination and a lot of junk" Thomas Edison

mopar_guy · Posted: Sun Oct 24, 2010 10:06 pm Post subject:

I think that the best way to find out would be to try some IR film and see what happens.

Thanks for the replies.

Dave

Henry · Posted: Mon Oct 25, 2010 12:00 am Post subject:

Don't forget the focussing issue with IR film. On 35mm camera lenses, there is a little red mark on the focus scale which is the necessary adjustment---IR focusses on a different plane than visible light (closer, IIRC). I don't recall ever seeing such a mark on my MF and LF lenses. Finally, exposure with IR film is largely a matter of guesswork, according to a source I consulted. Sounds like the way to go is to shoot some IR and keep careful notes of every single exposure; IOW, make your own instruction manual.

Les · Joined: 09 May 2001 Posts: 2682 Location: Detroit, MI

I don't know of any accurate way of putting a an IR mark on a scale for a Speed or Crown. "Miniature Cameras" have a much longer focus scale and the logarithmic nature takes care of the constantly changing amount you have to shift the lens.

Most people I know that shot IR "rack it just a bit and stop down like all hell"
_________________
"In order to invent, you need a good imagination and a lot of junk" Thomas Edison

1banjo · Joined: 16 Nov 2008 Posts: 492 Location: kansas

hey all
the film should have all that on the box BUT the focusses mite be by persentage

banjo