R.F. Royce - Precision Optical Components
Robert F. Royce, President
30 Holly Mar Hill Road
Northford, CT 06472 - USA
Voice: 203-484-7705
Fax: 203-484-9016
E-Mail: Please go Here

See what Anthony Wesley from Australia did with one of my 14.5" conical mirrors 
and now he found a comet impact

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See available telescope finishes

8" Dall-Kirkham
Simple and direct - The real thing
Performance like a refractor - only you get real aperture

The first 8" Dall-Kirkham has been completed. Like all my other D-Ks, this is a real, dedicated lunar-planetary-double star instrument, 25% physical obstruction, 180" focal length. No complex internal optics, just two mirrors. 

The Ultimate Newtonian
8" and 10" f/6 all aluminum construction OTA
for equatorial mounting
Performance like a refractor - only you get real aperture

Images as good as any refractor. With my complete system; conical mirror, high-quality optics, curved vane spider and fan ventilation; I guarantee performance like an apo but at a fraction of the price. And you get real aperture - real power

Planetary Dall-Kirkham OTAs
8" f/22.5  - 10" f/20  -  12.5" f/20
Just two mirrors - that's all!
===> First 16"  delivered
Prices inside

These complete Dall-Kirkham OTAs are now available upon request. Optical design is optimized for no compromise, small obstruction, high-resolution lunar, planetary and double star visual or imaging use. No multi-lens optical train. 8" and 10" sizes are closed tube and 12.5" - 16" are open tube designs. Delivery time depends upon available stock and range from a few weeks to six or eight months. 14.5" and 16" sizes are designed and available.  Read More

Build Your Own Telescope
Have fun and make something as good as you can buy
Several projects detailed here.

Building your own telescope is a lot of fun and you often wind up with something better than you can buy without spending a lot of money. Over the years I have developed several building projects. They are presented here so you can build a great telescope with high-quality optics.
Infinity Scopes


Intelligently designed as portable airline carry-on and travel-friendly telescopes, they embody the finest mechanical features and are carefully constructed of high-quality materials. They use my conical mirrors and make use of optical design features that I have found to produce the best images. 

New and interesting work by
Jan Fremerey 
At last a prime focus imaging telescope

Super deep sky images from France
Vince Steinmetz 
Be inspired by what a smaller mirror can do

And more stunners from the Canaries
Mischa Schirmer
With a 12.5" conical

In Bonn, Germany, Jan Fremerey has built a 10" f/5 prime-focus telescope that is taking amazing images of Jupiter. The prime-focus design is rarely used yet it is a natural for imaging. Here is his web site, a picture of the telescope and here is an animation of Jupiter and Io. All that from one of my 10" mirrors. 

See what Vincent Steinmetz, from Strasbourg, France has done with one of my 8" f/4.5 conical mirrors and Keller and Baader MPCC coma correctors. He has built his own astrograph and here is NGC 6888 M101, M81 and M1 (read his comments about zero image shift with a conical). And this new marvel of astro-imaging, NGC 891

Mischa Schirmer is a professional astronomer with his own personal set-up on Roche de los Muchachos, La Palma. The pics marked Newt are with my 12.5" conical and Keller corrector.

 We make Off-axis, Unobstructed Optical Collimators and Beam Expanders 

Off-axis, unobstructed optical collimators and Beam Expanders for science and industry are now available, and, due to our unique design and manufacturing techniques, they can be made larger and offered at prices considerably below those customarily encountered. Read More

Conical Mirrors

A brief explanation as to why these mirrors work so well in all sizes for all types of telescopes. Design advantages, thermal properties and mounting explained.


Nice building project on Pixels Above

Things you need to build a better telescope

Construction of an 8" f/5 astrograph

Optical products for science and industry

On-axis parabolic, ellipsoidal and hyperbolic mirrors routinely down to f/3

Off-axis parabolic, ellipsoidal and hyperbolic mirrors. 

ConVex aspheric surfaces, both on and off-axis 

Single and multiple element refractive systems. 

Larger high-accuracy flats of varying shapes. 

Interferometric analysis. 

Custom design work and design assistance. 

High quality optics for professional and amateur astronomy


Parabolic mirrors for Newtonian telescopes.

Compound reflective optical systems including Cassegrain, Ritchey-Chretien, Dall-Kirkham and various modifications. Refractive systems including achromatic and apochromatic objectives and full aperture corrector catadioptric systems including Schmidt, Maksutov and Houghton types along with near focal corrector systems.

Both standard full-thickness and conical cross-section mirrors for Newtonian and compound systems.

Articles for the amateur about telescope design, construction and use.


New product for both amateur astronomers and professionals.

 The conical cross-section mirror has arrived for Newtonians. Light in weight but no compromise in wavefront accuracy. - And no flotation cell required. Mounting is simplicity itself. The first real advance in lightweight larger aperture Newtonian telescopes. Details inside!