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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










Apogee 88mm and BT70 Binocular FMC eyepieces with 1.338" Barrel size.

The 9mm's - 11mm have 10mm ER

  9mm  (BT9) $129/each 60deg

10mm(BT10) $129/each 60deg

11mm(BT11) $129/each 60deg

14mm(Kowa14)$149 60deg  15mmER

15mm(Kowa15)$149 60deg  15mmER

17mm(BT17) $149/each 60deg  17mmER

18mm(BT18) $149/each  60deg 18mmER

19mm(BT19) $149/each 70deg 19mmER

20mm(BT20) $149 /each70deg 19mmER

Items above are priced individually.    You will need two for a set for your binoculars.

  .. .   We do complete alignment and Cleaning services for the Apogee / Miyauchi/ Kowa / BT and other Binoculars. Prices for cleaning and alignment starting at $99

      Click here.


Find the Focal length of your Binoculars below.

BT-70 Focal length: 376mm

RA-88 Focal length: 530mm





















































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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