81/4 inch f4.5 Xerox lens mande in England by Rank Taylor Hobson

Discussion in 'Darkroom Developing and Printing' started by otzi, Mar 27, 2008.

  1. otzi

    otzi Guest

    Would any one know anything about this lens. Is it a portrait lens or as I
    suppose a copy machine lens?
    I find some of the info I can glean somewhat sketchy.
    otzi, Mar 27, 2008
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  2. If it says Xerox on it its obviously a copy machine lens.
    These are typically Plasmat types optimised for unity
    magnification. Also, they typically have a limited range of
    f/stops although you can sometimes remove the mechanical
    stops in the iris mechanism.
    The color correction depends on the kind of copy machine
    it was intended for. Some older Xerox machines used blue or
    green light and the lens may be optimized for it. Newer
    machines are panchromatic or color and the lenses must be
    well color corrected.
    The performance of these lenses at infinity may be pretty
    good if they are not used wide open.
    Taylor-Hobson is a known for manufacturing very high
    quality lenses.
    About all I can say is to try the thing and see what it
    Richard Knoppow, Mar 27, 2008
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