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Thank you for visiting Siebert Optics!
Serving Large Observatories and the Amateur Astronomy Community alike.

200 Short Johnson Road
Clayton, NC 
USA  27520



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Eyepieces .965" / 1.25" / 2.0" / 2.7" / 3.0" / 4.0" / 4.3"


Large and Small Binocular Cleaning and Alignment services $99 Call or Email for details.


BT70 RA88 / Miyauchi / Kowa eyepieces


Binoviewer Alignment and Supercharge Services


Advanced Barlow Lenses including: Modular and 4 element Telecentric magnification multipliers


1.25" and 2" Advanced Binoviewers From $649-$1999


 Binoviewer OCA's and Accessories


Adapters - Meade Scopes and ETX


Binoculars - Quality Modified


Large and Small Non Illuminated and Illuminated Cross haired eyepieces.






Camera Focus Adaptors


Camera Adapters - Universal


H-Alpha Focus Accessories



Special binoviewer services and products you cant get anywhere else 

ICP's Image Correction Prisms for Newts




Extension Tubes


Large refractor modular OTA's


Eyepiece Comparisons


Focal Length Reducers




Planetary Fleece Blanket 


PST Accessories


Telecentric Barlow Lenses


Zero Magnification Adapter





Ladies Corner

Saturn Earrings  

Astronomy themed totes/purses


Free Domain Pictures

Astronomy Accessory Links of 

       products not offered 

       by Siebert Optics


Useful Astronomy Links


International Dealers


Astro photos


Non-Astronomy Items











SiebertOptics proudly offers the Planesphere eyepiece Series.

These special eyepieces can not be found anywhere else.

Now all you see below are available in .965" and 1.25" sizes.

Here are some reviews that have been done on the Siebert Optics eyepieces showing their advanced optical design  Click here, here, here, here,   here and  here 

See our Monocentrics ID eyepiece line. Click here.

Click to enlarge

Astronomers have known for years that the best views of planets and close doubles are to be had with clear skies, a good 'scope and the proper eyepieces for the job.
For most that has meant Orthoscopics and Monocentrics. The idea is to ensure the best contrast and least scatter so critical for planetary viewing. To make this possible you must use good glass, high polish, and the fewest air/glass surfaces possible. As good as Orthos and Monocentrics are, however and they may have certain advantages,  they still have 3 or more elements within them. The Logical solution...... a spherical singlet lens. No cemented layers to reduce image quality. No multiple elements to reduce sharpness and contrast. On axis, these special lenses produce the sharpest images of planetary detail available anywhere....

Siebert Optics is proud of the Planesphere family of Eyepieces. Call today to discover how Siebert Optics and Planesphere can enhance your viewing experience. Planesphere: The last word in critical viewing.

Siebert Optics Planesphere Series

Specify your size .965" or 1.25"

BK7 These excel from f/4 up (Brass add $40) Good eye relief *, Excellent color correction, All balls are Tack sharp.  

Fused Silica These excel from f/4 up (Brass add $40) Good eye relief *, Excellent color correction All balls are Tack sharp.  

BK7  7.5mm (#BK775)   $139

F.S.   6.5mm  (#FS65)  $139

BK7  6.0mm (#BK760)  $139

F.S.   5.0mm  (#FS50)  $139

BK7  4.5mm (#BK745)  $139

F.S.   4.0mm  (#FS40)  $139

BK7  3.5mm (#BK735)  $139

F.S.   3.0mm  (#FS30)  $139


30 day money back guarantee.    




 Reduced scatter and the best "on Axis" sharpness possible

Click on picture for details.












































Do you want an Ultra eyepiece with the reticule of your choice? Add $50 to the price  Click here to see choices.
Do you want an Ultra eyepiece with the reticule of your choice? Add $50 to the price  Click here to see choices.

All listed products come with a 30-day money-back guarantee* unless otherwise stated.

Specialty order items are not refundable (items made specifically for you).

We welcome
International orders!.

We accept Visa, Mastercard,


  American Express. U.S. Money Orders, and Personal Checks (held 10 working days for clearing)Online payments may be made securely through



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