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         Products:

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

BT70 RA88 / Miyauchi eyepieces

Advanced Barlow Lenses including: Modular and 4 element Telecentric magnification multipliers

1.25" and 2" Advanced Binoviewers Starting FMC units at $399

 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 including Miyauchi Starting at $49 Call or Email for details.

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

Eyepieces  

Eyepiece Comparisons

Focal Length Reducers

Miscellaneous

Observers Hood - light blocking 

Planetary Fleece Blanket 

PST Accessories  

Astrotech and William's Optics Focuser Services

Telecentric Barlow Lenses

Refractor Knobs

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

      Fabrics

      Purses

Instructions for 

1.6x corrector for Stellarvue BV1, Burgess, BC@F Binomate, Moonfish, Celestron and any other similar looking binoviewer.

For Dob and Newtonian users see important information under illustration #5.

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Important Information

Newtonian and Dob users:  The bottom element can be threaded out to extend the length of the OCA.  This gives extra back focus for some dobs that have limited amount of intravel.  When used with refractors with 2" diagonals it is important to have this element screwed in all the way so as not to have contact with the diagonal mirror.  

For Williams Optics 2" diagonals with low profile 2" to 1.25" stepdown adapters you will likely need a parfocal ring to keep the OC from extending too far into the diagonal.  Be careful not to come into contact with the mirror.  

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