Hours:

11am - 11pm EST 
Monday - Friday

1pm-11pm Sat 

 
Cell:

919-614-4297 Cell

eMail:

harrysiebert@nc.rr.com

Above is to send in orders and Q&A.

Below is My Paypal address

hs3980@nc.rr.com  

 


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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About Siebert Optics

Contact Information

 

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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

 

(Specialized Binoviewer services you can't get anywhere else)

 

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 

Also can  >  Click here.   And here.

 

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

     

 

 

 

 

 

 

Special Diagonals that Solve problems.

2" Diagonals

Low profile binoviewer Diagonals. Click Here

2.7" and 3" Diagonals: Click here.

 

Ad #1

Focusable 2" diagonals with (S)elf (C)entering eyepiece holder.

Price to convert your diagonal is $149

If we purchase and/or stock the diagonal it will cost the current cost of the brand you choose + $10 for purchase and stock costs.

Here are some diagonals you can choose from. You can click on the name to see the diagonal you are purchasing before conversion. 

If we convert your Daigonal

Converted focusable SC   WO 97% Refractor Diag $257

Converted focusable SC   WO 99% SCT  Diagonal $347

Converted focusable SC Astotech Ref Diagonal   $238

Converted focusable SC Astotech SCT Diagonal  $248

 

Picture soon to come

 

Do you have minor to "Gorilla" mirror shift in your LX series or other telescope? Are you thinking about installing a focuser after your visual back to fix the problem?  You may create more problems then you fix. Some SCT scopes have limited room between the visual back and scope fork and a focuser may make slewing to the zenith impossible.

 Or  you may not be able to come to focus with certain accessories like focal length reducers or binoviewers because of the added length of the focuser.  If nothing else the added length of the focuser will increase the magnification of your SCT by as much as 15%  

Would you like to have the problem eliminated quick and neatly without adding any more length to the back of your scope or focal length?  At the same time have your eyepiece holder a self centering type that is precise and holds your eyepiece firmly without marring the barrel. Even with the thumb screw compression ring type you really have to torque the screw down to get a good hold on the eyepiece. Not so with the feather touch self centering holder replacement sold by Siebert Optics. If we convert your diagonal the cost is $149

 

 

 

Ad #1C 

Please tell me your binoviewer type and how old it likely is.

Look below for instructions.

 Special low profile 1.25" diagonal for your Refractors including refractors such as WO/Astrotech 66mm/80mm ED/ Orion ED 80mm and 100mm or other refractors you might have with a 2" visual back

Price of diagonal is $199 #(Diag125)     99% transmission diagonal.

Instructions "Click here"

See YouTube video instructions here Click.

Look below for more pictures

 

This will work with the Orion ED series/WO and Astrotech and many other refractors.

What will this diagonal do when used with a Burgess/WO/Stellarvue/Orion/Celestron and other like  binoviewers including my own BN25mm.

Focus your refractors without an OCA! 

Sometimes you are so close to focus with binoviewer in your 1.25" diagonal that you can almost taste it, but can't quite get there.

Thread this diagonal in the bottom of your WO, Burgess, Celestron,Orion or Stellarvue binoviewer (Remove nose piece) and attach it to your refractor and you will be binoviewing without the added magnification of an OCA and at a price that might be less expensive then most of my OCA correctors. 

 

Scope in solar use and focusing nicely

Instructions below. 

Different binoviewers may need different attachment pieces.

The front two thumb screws have been replaced with nylon setpoints. The supplied Hex key is to loosen and tighen these. The Hex has no elbow so you do not tignten too hard. The  thumb screw out the back is for locking it in place(easy on this one too). The two up front is for fitting in the inside channel.

 

 

 

 

 

   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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,

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  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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