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Roger M Derby  wrote-

>They're at  http://www.edmundscientific.com/
>
>Didn't you just describe the standard prism from an old pair of binoculars?
>
>Roger
>
>
>----- Original Message -----
>From- "Paul Hirose" <71202.2014@COMPUSERVE.COM>
>To: 
>Sent: Thursday, July 13, 2000 3:09 AM
>Subject: [NAV-L] Blish prism
>
>
>> Here in the U.S., Edmund Scientific has been selling optics (surplus
>> and new) to experimenters since the 1940s. I'm pretty sure I've seen
>> in their catalog a prism of the type George Huxtable mentioned, i.e.,
>> turns the line of sight 180 degrees and offsets it laterally some
>> considerable distance.
>>
>> They surely have a Web site, though I don't know the URL. A search
>> should turn it up easily, though.
>>
=====================================

George Huxtable replies-

Thanks to both correspondents. I have now placed an enquiry with Edmund
Scientific.

Roger asks about a prism from prisnatic binoculars, but I don't think it
would do the job. Paul was responding to my initial inquiry of
9 July, which said, inter alia,-

 "What I need is almost identical to a Porro roof-prism, and any prismatic
binocular contains 4 such prisms. Unfortunately, the standard prism from
binoculars doesn't give enough offset for the 80mm. that is required, so I
expect to require something specially made. Any suggestions would be most
welcome."

If Roger has come across binocular prisms that can provide the required
light-path offset of 80mm or so, from a pair of giant's binocs perhaps, I
would like to hear about them.

George Huxtable.

------------------------------
george@huxtable.u-net.com
George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
Tel. 01865 820222 or (int.) +44 1865 820222.
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