Re: Re[2]: [ATM] On Axis Foucault (try this instead)

["David Harbour" <scarab2@cox.net>]

You are, of course, right Bob.

I have thought of another test for Richard, which I am going to describe
now. You always have deep insight into these kind of things (I hope to think
that I do too). Yes, the scale of the work he has to do will be the problem.
But I think I have an idea; it will, unfortunately, require a pellicle.

Dave
----- Original Message ----- 
From: "Bob May" <bobmay@nethere.com>
To: <atm@atmlist.net>
Sent: Wednesday, June 15, 2005 12:26 PM
Subject: Re: Re[2]: [ATM] On Axis Foucault (try this instead)


> Supprisingly, the biggest problem that you're gonna have is reducing the
> size of the components to easily do the test.  I'd consider that a beam
> splitter would be quite necessary to get the light source and the returned
> beam coincident to each other.  You will also be using a small splitter (a
> 5mm cube will be more than big enough, I'd think) and the whole assy.
could
> probably be hung on the lens of the camera and you don't want to use a
> general purpose lens as the aperture stop is too far back into the lens
but
> rather use a doublet lens for the purpose.
> You also run into the problem of the wide angle needed for the test (F2 is
> rather short for the Foucault test) but it can be done if you work at it.
> Bob May
> bobmay@nethere.com
> http://nav.to/bobmay
> http://bobmay.astronomy.net
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>


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