Re: [ATM] Lens requirements

["Bob May" <bobmay@nethere.com>]

Basically what you want is to turn that display's points into a parallel
light beam.
This is usually done with a single lens with the display at the focal length
of the lens.  Since you are also trying to see something else at the same
time, a partially reflecting mirror set at 45 degrees or so to the line of
sight will put the image of the display into the view.  A doublet lens will
decrease the color problems which are really insignificant in this case.
For a quicky test, go get a set of eye loupes in different magnifications
and play with them til you have what you want.  Eye loupes are always a
useful tool to have about so you won't really be wasting your money buying
them.
This is basically what the heads up displays are doing and is what you are
trying to do.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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