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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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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









Low Profile Image Correction Prisms for Newts and refractors straight though.

1.25" Prism

This is an extremely small image correction prism that inserts into the bottom of any 1.25" eyepiece.  These screw directly into the bottom of your eyepiece where the filter would go.

This one sells for $32. (ICP125STD)

We also sell a wider aperture that works with eyepieces up to 25mm for
$50. (ICP125W) 

                                                                  It has a 3/4 " intravel requirement with no barlow and it disappears into your focuser.

Makes this into this 

The field of view begins to be restricted when used with eyepieces greater than 21mm.  It also eliminates the need for a barlow-like adapter to add to the eyepiece's height.  Since it attaches directly to the bottom of the eyepiece, it fits into your focuser or barlow without any additional lenses or focuser height.  Perfect for refractors (when used without the diagonal) and reflectors that need the image corrected both right to left and up-side-down to right-side-up.  A great alternative to the bulky, expensive erecting prisms on the market.  It adds 0" height to the lens that it is inserted into.  Used mainly for terrestrial use.

(These will not work with the Meade ETX telescope.)


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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