Slip over safelight filter

Discussion in 'Darkroom Equipment' started by eheldreth, Feb 8, 2005.

  1. eheldreth

    eheldreth Member

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    I have been considering using an old laptop I have for timing, calculations, and such in my darkroom. After another post here on using a PocketPC, it got me wondering. Does any one know of a filter that could be sliped over the screen of a laptop to make it safe for use in the darkroom.
     
  2. Nick Zentena

    Nick Zentena Member

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    Ruby lith? You could get a sheet and put several layers over the screen. Then test.
     
  3. Lee L

    Lee L Member

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    I've used theater gels to make computer screens "safe" to use with night adapted vision in observatories. Rosco and Lee are the two big names in the US, and you could find them online from a theater supply house or at a local theater or studio lighting supplier. Lee doesn't have a great online set of information to choose with, but Rosco has transmission charts at: http://www.rosco.com/us/filters/roscolux.asp#SPECIFICATIONS

    Look for the amber or red filters that stay away from the wavelengths where your materials are sensitive. You should be able to find a sheet about 21" by 24" (but double check me on size) for well under $10 plus shipping.

    Wonder if there's a "development by inspection" green...

    Lee

    I just checked, and it appears that B&H and Calumet both carry a good selection of the Roscolux filters in stock. These should be tougher than rubylith, and the #27 should do for red light. Sheets are 20"x24", and you can double them if needed. There's also an amber that might work, depending on your paper, and a green diffusion material to try for development by inspection.
     
    Last edited by a moderator: Feb 8, 2005
  4. Bob F.

    Bob F. Member

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    My laptop had a red glass Ilford filter over it but I recently made a cover from red gel (2 layers) and cardboard that slips over the screen as the safelight filter was too dark.

    Cheers, Bob.