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919 553-3980



919 553-3980



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 From .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









(S)tar (S)plitters Ortho or SS3 Series.

See our UT Monocentrics and Planesphere eyepiece line. Click here.

Siebert Optics SS3 Modified Orthos. Enhanced 5 element design. 

   The Star Splitter or SS3 series. With 60 deg FOV and 12mm ER. Large eye lenses.

There may be other Focal Lengths are available not listed here. Inquire for details.  Click here

Specify series and  size. Example: (SS3/4.9mm)

1.9mm,   <<New

2.4mm,   <<New

2.9mm,    3.4mm

3.9mm,    4.4mm

4.9mm,    5.4mm

5.9mm,    6.4mm

6.9mm,    7.4mm

7.9mm,    8.9mm

9.4mm,    9.9mm



 8.9mm-9.9mm $99. These excel from f/6 up (Brass add $30)

 2.9mm-7.9mm $139. These excel from f/3.3 up (Brass add $50)





 Outstanding performance with a lower price. Now these are made in more powerful size.


  It all comes together here. Razor sharp performance, Good eye relief and 60+ deg FOV. Sharper and with higher contrast than anything you have tried.   30 day money back guarantee.  

Brass Ortho's available >Click>

This is an Enhanced Orthoscopic design that blends the best of the Abbe Ortho design with additional advanced features like ER and Large FOV.


All eyepieces are  threaded for filters 





All eyepieces are  threaded for filters
























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!.

available in any dollar amount you wish to purchase.

I accept PayPal, the #1 payment service in online auctions!

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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