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

"otzi" <xx@[EMAIL PROTECTED]
> wrote in message 
news:47eb6074$0$26468$afc38c87@[EMAIL PROTECTED]
> Would any one know anything about this lens. Is it a 
> ****trait lens or as I suppose a copy machine lens?
> I find some of the info I can glean somewhat sketchy.
   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 
does.


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Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]