On September 15, 2004 6:53 am, Richard Knoppow wrote: > > These are curious lenses. From the shape of the cells they are probably > Plasmats, similar to the Symmar. This type of lens has been often used for > wide angle process lenses, used for making offset lithography plates. The > focal lengths are typical of process lenses. Its curious that the > construction is not described. Also, the coverage of both lenses is stated > to be the same. I doubt it. Assuming the image circle for the shorter lens The longer lens is listed to have the same coverage at F/14 [barrel mount] and at F/22 [shutter mount]. Maybe the coverage is conservative at 900mm-) > to be correct the coverage angle is about 78 degrees, about typical for a > Plasmat type. The longer lens has the same coverage but it should actually > have the same angle so the image circle should be considerably larger. The longer lens isn't the same design is it? It's lighter. It looks different. They look like a wide and a normal lens for 24x24. I'm afraid to even ask what it would take to feed a camera that size. Nick ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.