11am - 11pm EST 
Monday - Friday

1pm-11pm Sat



919 553-3980



919 553-3980



Thank you for visiting Siebert Optics!

200 Short Johnson Road
Clayton, NC 
USA  27520


Place Online Order

     (opens in new window)



Home Page

About Siebert Optics

Contact Information







Telescopes for sale



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


BT70 RA88 / Miyauchi / Kowa eyepieces


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


Binoviewer Alignment and Supercharge Services


Adapters - Meade Scopes and ETX


Binoculars - Quality Modified


Large and Small Non Illuminated and Illuminated Cross haired eyepieces.


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


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




Observers Hood - light blocking 


Planetary Fleece Blanket 


PST Accessories


Telecentric Barlow Lenses


Zero Magnification Adapter





Ladies Corner

Saturn Earrings  

Astronomy Themed  Fleece Blanket 

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









Burgess/WO/SV 1.25x - 3.5x multi mag Corrector 


Refractor setup #1-4 below 

Reflector/Dob setup #5-7 below 

No extension tube used. 2" diagonal are left out here in 1.25x mode. Only 1.25" diagonals are supported. This is good since it shortens your light path anyway to use a 1.25" diag. 


All Elements and Tubes have # marked. Elements have an > arrow to indicate the direction the element should be aimed. Lens elements should have the arrows pointing away from the binoviewer or toward the objective at all times.


Below #4 element used only.


The x2 setup above might work in a 2" diagonals. But it is primarily for 1.25" diagonals


Refer to important information at bottom of page for safety tips on this configuration. 


Starting here below are Dob setups.

All components have the # marked as well as an > arrow to indicate the direction the component should be aimed. Lens elements and extension tubes should have the arrows pointing away from the binoviewer at all times.

Lens element #3 ....Tube #2......tube#1.....Lens element #4


Tube #1.....Lens element #3.....Tube #2.....Lens element #4 are used for x2


Only tube #1 and lens #4 are use in 3.5x mode

Important Information 

For Williams Optics 2" diagonals and others with low profile 2" to 1.25" step down adapters  Be careful that the OCA does not come into contact with the mirror.  


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



Babelfish.jpg (12943 bytes)