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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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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


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.






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




Planetary Fleece Blanket 


PST Accessories


Telecentric Barlow Lenses


Zero Magnification Adapter





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Saturn Earrings  

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Modified Binocular.

 All Binoculars on this page have APO properties

These are the sharpest and most comfortable binoculars you may ever use.

See new APO 8x25mm and 10x25mm all purpose Binos below. Click Here.

See pictures at the bottom of the page.

8x25mm/10x25   Modified APO Triplet Objective.
Professional Collimation/cleaning services for standard binoculars. $50 Advanced binoculars $100

6x40mm  6x50mm  7.5x50mm 

Refit with special 6-element eyepieces 22mm-ER 

$299. (6x40)

$299. (6x50)

$299. (7.5x50)

Eyecups removed for optics viewing

The image quality will blow you away.

These are made from average units (Mechanically they function well). With the eyepieces replaced. Normally binocular eyepieces are 3-4 element with marginal correction for color and edge sharpness. But the correction on Siebert 6 element eyepieces are exceptional. The eyepieces used for refit are shown in the picture below when compared to a Japanese made Meade 26mm Super plossl. The eyepieces used do not add to the color correction problem (but in fact minimizing it.) False color is almost completely absent under most viewing conditions. 

A little doubt is understandable.

 Many people think that the Objectives and prisms have more to do with the quality of view then the eyepieces. Is this true? NO!, not at these magnifications. A quality 50mm objective could be pushed to 100 times without a failure. Most binoculars objectives can easily be pushed to half of that. These binoculars do not have to go nearly that high but as you see in the pictures at the bottom of the page they could go to 40x. In this case prisms are not the bottleneck. It is the failure of the eyepieces that brings down most binoculars which in this case is easy to fix.

 I have never felt comfortable with a pair of binoculars under $400. But after refitting one of my own I could immediately see a big difference in terms of comfort, sharpness and eyerelief which is 22mm in this case. The stars never looked like pin points in the field and the images in both eyepieces never seemed to blend well at night. Their was always a spike of flair I could not get rid of. The stars always looked a little different for each eyepieces which was unacceptable. The replacement eyepieces are not wide field at 50deg but are razor sharp to the edge of the field and have be given a lot of attention as to collimation so the stars blend into one without problems.

So you have 60 days to determine if the views these provide are good enough to justify the cost. They also have separate adjustable eye focus and a user collimation adjustment. The units shown have their rubber eyecups removed so you can see the optics better. Every unit is tested under the stars before they can be shipped so there might be some shipping delays. This is important so as to assure a perfect star test.

 The criteria I use for determining which units I use to convert is they must mechanically function well. I have to be familiar with the quality of the objective lenses and prisms that are being used. These may not be for everybody, but if interested feel free to contact me. I will even pay your return shipping* if you do not like them. Try getting that from any other company. I am confident that after you use them once you will not want to be without them. 

Remember 60 Day return policy and free return shipping if not satisfied, you simply can't go wrong.

Harry Siebert
*For free return shipping call for RMA# only in the US



Refit with special 

6 element eyepieces 22mm ER 

  $349. (11x70)


For Oberwerks as the base pair used.

  $399. (OB11x70)






The eyepieces used for conversions are the Siebert 26mm's, above on right.


The pictures below are to give an idea of the color correction mainly even though you also can see the fact that the binoculars do not bend the edges of the FOV. Since the camera was hand held in front of the binocular eyepieces, these pictures tell you little about the sharpness of the binos which is better then any pair under $500 and as good as pair costing much more.



The Binoculars below are a new addition. Triplet Objectives Are Color free and sharp to the edge. They have 19mm ER. and 55deg FOV.

The 8x model has a field of 340 ft@  1000 yds. The 10x is 290 ft . They deal with impacts better then most because they do not use binocular cement to hold the prisms in place. The are light weight and waterproof


They have most of the same basic design benefits mentioned above but are much less expensive. They are great for every day use as well as for  Astronomy. They have become my favorite grab and go unit. The  8x25mm and 10x25mm are $199 (Tri8x25) (Tri10x25)


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!.

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