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Rollfilm holder for infrared?

 
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mopar_guy



Joined: 07 Aug 2008
Posts: 126
Location: Washington, the State

PostPosted: Sun Oct 24, 2010 12:16 am    Post subject: Rollfilm holder for infrared? Reply with quote

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
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Henry



Joined: 09 May 2001
Posts: 1442
Location: Allentown, Pennsylvania

PostPosted: Sun Oct 24, 2010 5:02 pm    Post subject: Reply with quote

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.
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Dan Fromm



Joined: 14 May 2001
Posts: 1885
Location: New Jersey

PostPosted: Sun Oct 24, 2010 5:16 pm    Post subject: Reply with quote

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

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



Joined: 07 Aug 2008
Posts: 126
Location: Washington, the State

PostPosted: Sun Oct 24, 2010 5:32 pm    Post subject: Reply with quote

The darkslides look to be made of plastic.
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Les



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

PostPosted: Sun Oct 24, 2010 9:06 pm    Post subject: Reply with quote

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??????
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mopar_guy



Joined: 07 Aug 2008
Posts: 126
Location: Washington, the State

PostPosted: Sun Oct 24, 2010 10:06 pm    Post subject: Reply with quote

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
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Henry



Joined: 09 May 2001
Posts: 1442
Location: Allentown, Pennsylvania

PostPosted: Mon Oct 25, 2010 12:00 am    Post subject: Reply with quote

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.
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Les



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

PostPosted: Mon Oct 25, 2010 12:39 am    Post subject: Reply with quote

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"
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1banjo



Joined: 16 Nov 2008
Posts: 478
Location: kansas

PostPosted: Mon Oct 25, 2010 3:01 am    Post subject: Reply with quote

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

banjo
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