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Re: [ATM] very long focus objective



Bob May wrote:
> I would kind of think that a 12.5 degree FOV would also be a bit difficult
> to put an EP to and obtain such a FOV!  Unless I miss my guess, that is an
> EP that is about 21' in diameter!  With that, you could probably put a fair
> number of smaller EPs about and look at different buildings in the area.
> Interesting but, unfortunately, not what the basic intent of the display
> would be.  Still, it would be a neat giggle to do.
> Bob May

This may be a side effect, but it is not the original reason for
designing in such a wide FOV.  That wide a FOV allows a larger
tolerance in setting up the lens on the pole -- it may not be
a fully qualified individual that has to shinny up the pole and
set the lens on top (in a Chicago winter, no less!!).  The larger
the FOV, the less strict the alignment has to be.

-- 

Rick S.

http://users.rcn.com/rflrs

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