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Peter Bresler

Lagoon Nebula,M8, LRGB

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New 20" F3.0 Waite Research Primary Telescope Mirror Available

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We have a 20" F3.0 telescope mirror available for immediate delivery.  This 20" F3.0 mirror is on a 1.625" Supremax-33 substrate which was molded and annealed by United Lens. As you can see from the attached reports, this is a premium telescope mirror.  It is coated, center spotted, and has never been mounted in a telescope.

This is a terrific mirror and I am happy to send this one to a new home for $8,900 plus shipping.  And your big benefit is that we can ship this mirror out in one business day.  You won't have to suffer the 18-month wait to have a new mirror made!  Custom 20" F3.0 mirrors retail for well over $10k so this one will save you a bundle of cash.

If you are thinking about building a new 'scope, this mirror will be a joy for you.  With a 60" focal length you will never need a ladder, and you will be able to do all of your observing with both feet firmly on the ground.  The wide field of view is just spectacular.  It's easy to find objects, especially with a longer-focus eyepiece.  See the Andromeda Galaxy, M110 and M32 all in the same field of view!  And the 20" mirror with such a short focal length gives you tight, bright stars for beautiful views of clusters and rich star fields.  Note that you will probably want to use a coma corrector with this short focal length primary.

This mirror weighs about 36 pounds.  You can see from the included FigureXP reports from the Foucault test that this mirror has a great figure.  FigureXP rates the mirror at better than 1/20-wave P-V, with a Strehl Ratio calculated at 0.99 on the report.  You should understand that FigureXP is opten optimistic with its calculations. In the past we have had mirrors independently tested via interferometry, and they are usually rated at around 0.96 or 0.97 Strehl, and better than 1/10th-wave P-V.

I'm sure you will enjoy many years observing the skies with this mirror!  Thanks!