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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









Superior Performance and Performance + 1.25" Eyepieces

Here are some reviews that have been done on the Siebert Optics standard eyepieces.  Click here.  here or here  

Brass eyepieces for your Brass telescope (remember brass eyepieces are heavier.)  Brass add $30 to eyepieces below.

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

****All Eyepiece are  threaded for filters*****


"These are a continued evolutionary improvement of the older standard Series. The same design with improvements to ER and edge quality."

9mm and 10mm

These are Computer generated 3 element design eyepieces. These are FMC coated. The combination of fewer elements and FMC coatings gives these eyepieces some of the best light transmission properties possible.  FOV is 60 degrees  They are threaded  for light filters.

$49. 9mm (EP125-9) Fixed eyecup 10mm ER

$49. 10mm (EP125-10) Fixed 10mm ER

$89. 14mm (EP125-14) Rotating 14mm ER

$89. 17mm (EP125-17) Rotating 16mm ER

$69. 35mm (EP125-35) Fixed 20mm ER  --Best used over F6

 Brass add $30*



9mm and 10mm Below.

35mm Below.





































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!.




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