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mopar_guy
Joined: 07 Aug 2008 Posts: 126 Location: Washington, the State
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Posted: Sun Oct 24, 2010 12:16 am Post subject: Rollfilm holder for infrared? |
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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: 1644 Location: Allentown, Pennsylvania
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Posted: Sun Oct 24, 2010 5:02 pm Post subject: |
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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: 2144 Location: New Jersey
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Posted: Sun Oct 24, 2010 5:16 pm Post subject: |
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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
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Posted: Sun Oct 24, 2010 5:32 pm Post subject: |
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The darkslides look to be made of plastic. |
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Les
Joined: 09 May 2001 Posts: 2682 Location: Detroit, MI
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Posted: Sun Oct 24, 2010 9:06 pm Post subject: |
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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 |
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mopar_guy
Joined: 07 Aug 2008 Posts: 126 Location: Washington, the State
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Posted: Sun Oct 24, 2010 10:06 pm Post subject: |
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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: 1644 Location: Allentown, Pennsylvania
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Posted: Mon Oct 25, 2010 12:00 am Post subject: |
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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
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Posted: Mon Oct 25, 2010 12:39 am Post subject: |
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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 |
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1banjo
Joined: 16 Nov 2008 Posts: 492 Location: kansas
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Posted: Mon Oct 25, 2010 3:01 am Post subject: |
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hey all
the film should have all that on the box BUT the focusses mite be by persentage
banjo |
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