Re: [ATM] Mounting an Achromatic Lens

[Mike Lockwood <melockwo@uiuc.edu>]

Tom,

Polk, Tom wrote:
> I have an old Phillips Vesta web cam that I'm trying to integrate with
> my Foucault tester. Does an achromatic lens have a "front" to mount
> toward the mirror? Both sides of the lens are convex, one has a stronger
> curvature than the other. The lens, Dia: 14.2 mm, Focal: 25mm. Thanks.

Well, since no one has replied, I will go out on a limb and say that 
the diagrams of simple achromats I have seen in catalogs, etc, have 
stronger curvatures on the front.

If you want to check it further, view a star with it, and see which 
way provides better color correction.

If I'm wrong, someone please correct me.  I know very little about 
lenses.  Mostly I stick to mirrors.

	Mike Lockwood

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