Litho film is made by several manufacturers, usually in sheets, although there is 35mm roll film out there. Generally speaking, it is about half the speed of RC papers, so it requires about twice the exposure. Start with ISO 2.5, or thereabouts.
For a pinhole camera with f/250 try 2 1/2 to 3 min as a beginning exposure time in bright sun. You can usually buy a few sheets from a small print shop. The 12" x 18" size is great for big negatives & you can cut it into any smaller size you need. Handling is OK in red safelight (I use a red christmas bulb to save $). Process in litho developer (2 parts) for high contrast or conventional B&W paper developer for continuous tones. There is a lot of discussion about the right dilution for B&W paper developer. Using it at paper strength makes for fast development of litho film, so a shorter developing time is indicated. Diluting it gives better control over the image due to the extended time but the developer will become exhausted more quickly. We mix B&W print developer twice as strong when making contact sheets from 35mm negatives on litho film, which gives you quick B&W slides to send in to exhibits orcompetitions. The emulsion is tender & scratches easily, so treat it gently. Jim K ----- Original Message ----- From: che lawrence To: pinhole-discussion@p at ??????? Sent: Friday, January 05, 2001 3:08 PM Subject: [pinhole-discussion] ortho lith film have any of you used ortho lith film? i don't know anything about it but heard that it can be used as an alternative to paper. any info on exposure times would be helpful. thanks ------------------------------------------------------------------------------ Get your FREE download of MSN Explorer at http://explorer.msn.com _______________________________________________ Pinhole-Discussion mailing list Pinhole-Discussion@p at ??????? unsubscribe or change your account at http://www.p at ???????/discussion/
