200 Short Johnson Road
Clayton, NC 
USA  27520

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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

See our Planesphere eyepiece line. Click here.

Click on pictures. 

Astronomers have known for years that the best views of planets and close doubles are to be had with clear skies, a good 'scope, and the proper eyepiece for the job.
For most, that has meant Orthoscopics. To ensure the best contrast and least scatter, so critical for planetary viewing , good glass, high polish, and the fewest air/glass interfaces as possible, are essential. Although I have a Single element line eyepieces called the Planesphere this Monocentric line is going to still have definite advantages. The Planesphere might have the Theoretical edge that the single element provides for the most critical on axis viewing. But the Mono is pulling in at such a close second that if you add the other advantages it has over the Singlet EP's you realize they will always have an important place in visual Astronomy.

The Mono line gives a wider, flatter useable field to work with. More generous E.R. and 100% guarantied color correction across the field.

In short these new MonoCentrics ID are a pleasure to work with in all respects. How will they compare to other Monos on the market? They hold their own against anything out there at any price and cost about 1/3 what other quality Monos do.  See ad below.

    Some may ask why have MonoCentrics start at 10mm instead of much lower MM sizes. The Answer..  You can have the best of Both Worlds. You can have the Minimal glare and high contrast images you get with a Low MM Mono but by using the New Amplifiers/Field flatteners that are designed with a Longer F.L. and Superior Dielectric Coatings. They are also out of the range of the eyepiece elements so as not to cause interference. They are more a part of the telescope system then a mate for the eyepiece. Many scope systems are build with Internal self amplification Optics. This is a similar concept. Now you can add the advantage of the Field flattening and add Eye relief to the mix and its not hard to see how these will be a pleasure to use. For those who want to use stand alone single eyepieces in a higher power application there is always the..........These are the finial word in Critical High Resolution viewing.

 Harry Siebert