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                 Elliptical/Flat Optics




All current production is with Fused Quartz. Most ellipticals diagonal mirrors are  in stock!.


We manufacture optical flats in just about any size, shape and material, including your material. If you need something other than listed below, send us a detailed message of what you need and we will provide you with a quotation.

We also manufacture larger elliptical diagonal mirrors as used in astro-imaging telescopes and large Newtonian/Dobsonian telescopes.

Testing throughout is done by non-contacting interferometry whenever possible and are tested at full aperture whenever possible. All of our elliptical/flat optics are precision pitch polished and have excellent surface quality, thoroughly inspected at every stage of manufacture. Our enhanced aluminum coatings are applied for 45-degree angle of incidence.

We purchased a large batch of Quartz diagonal blanks from ProtoStar. We are processing them and we will add them to this site as they become available. A majority of them are for upgrades for import telescopes. Our first available size is 70mm (2.75") minor and they are ready to ship. Call Frances for current pricing, Thanks!



70 mm Quartz Diagonals.jpg

Large elliptical Diagonal Flat Mirrors

We have begun regular production of fused quartz EDM's. Our blanks are diamond machined on all sides. A safety bevel is provided, front and back, for safe handling. Precision polished until 1/10 wave or better, P-V is usually much better. I can "hand-select" one for you! Test data with serial number provided. Includes our enhanced aluminum coatings.

We have most sizes in stock!

Call, text or e-mail for pricing 



All sizes 5.00" and larger are 1.0” thick.

Enhanced aluminum coatings at 45 degree angle of incidence optimization.

4.0" - Before refigure - this is from a 16" import Dobsonian

4.0" - Ostahowski Optics refigure

5.5" - Before refigure - this is from a U.S. manufacture who includes this in their own expensive Dob scopes

5.5" - Ostahowski Optics refigure

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