Sub f/4 PrimaryMirrors
(Prices upon request)

All orders are custom manufactured, one at a time. Pricing is upon request and structured around your exact requirements. All of our sub f/4 primaries are guaranteed to be fully corrected to the edge. Each one is painstakingly figured & tested by both double pass auto collimation-null testing and interferometry. Your 100% satisfaction is guaranteed!

These sub f/4 primary optics will make outstanding “short” RFT telescopes or fantastic imaging telescopes. We can do optics as fast as f/3.3, double pass - null figured & tested. We use Pyrex or better substrates, but we can also use plate glass or BK-7 if substrate costs are an issue.

A 50% deposit is required upon acceptance of terms of the order and the balance is due just prior to shipping. We have reasonable and realistic lead times. We reserve the right not to honor any previously posted pricing. We reserve the right to adjust pricing due to fluctuations in raw material costs beyond my control. Please contact me to discuss your requirements in further detail.

Please allow us an opportunity to quote you a price on your next "fast" set of optics

A 20" f/3.95 primary tested via interferometry