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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         Products:

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.

Astrographs/Telescopes

Camera Focus Adaptors

Camera Adapters - Universal

H-Alpha Focus Accessories

Converters

Special binoviewer services and products you cant get anywhere else 

ICP's Image Correction Prisms for Newts

Diagonals

Extension Tubes

Large refractor modular OTA's

Eyepiece Comparisons

Focal Length Reducers

Miscellaneous

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

      Fabrics

      Purses

End Cap solutions for many applications 

Including T - 2 and T thread applications 

Delrin 1.25" or 2" ID (Female) caps for diagonal inlet $15

Delrin 1.25" or 2" OD (Male) for top eyepiece holder $15 

0r both ID and OD Delrin caps for $15 

The above is for all 1.25" and 2" cap applications both male and female

Delrin Binoviewer Cap set with bottom cap and top male plugs  all 1.25" $30  

Delrin Binoviewer Cap set with 2" bottom cap and top 1.25" male plugs $30  

The above is for all binoviewers with 1.25" or 2" cap applications.

Baader T - 2 Male or Female Caps $15 each

Baader Binoviewer Cap set T - 2 Female and 2 Male 1.25" eyepiece plugs $40

The above are for Baader diagonals and binoviewers

Camera T thread Male or Female Caps $15 each

The above is for all camera T - thread applications both male and female.

SCT male end cap $15 each

The above is for Celestron SCT diagonals