The Celestron Stereo Binocular Viewer gives you incredibly comfortable three-dimensional viewing, with far less eye fatigue from extended viewing.

Using two eyes to view through a telescope achieves the odd duality of being both relaxing and thrilling.  It is relaxing to not have to squint or cover one of your eyes, affording longer sessions without fatigue.  And the perception of depth you'll get from using both of your eyes is an awesome thrill that you'll not understand until you experience it.

Though the stereoscopic effect of using two eyes shouldn't be relevant at stellar distances, in actuality that theory is plainly dispelled.  The background sky seems cast far beyond the star, an inky black canvas setting off the object of interest like never before.  Subtle nuances of double stars are revealed for the first time despite dozens of previous gazes.  Though less than half of the previous amount of light reaches each eye, it nonetheless seems brighter because your mind's eye "gains" much more than is lost by the mirror.

Of course, all of this comes at the expense of needing two eyepieces and this device.  While not exactly inexpensive, it is a far cry less dear than similar units from other manufacturers.  But if you are an enthusiastic observer after the mystical unencumbered walk through space, then this is the tool that will deliver it.

The Celestron binocular viewer is well tailored and solidly constructed, with lots of good thinking in its design.  It has a rubberized and dimpled surface to both absorb knocks and provide a firm grip in damp, cold conditions.  The choice for the type of prism and its coatings was not skimped a bit, for high resolution and edge brightness.

Currently the Celestron Stereo Binocular Viewer works properly with all of Celestron's Schmidt-Cassegrain design telescopes, and very likely with any Schmidt-Cassegrain.  Many refractors with a removable focuser drawtube can also be used, and with those which don't have a removable tube you can generally achieve focus with a short 2x Barlow lens placed in front of the device.  The binocular viewer is designed to go directly into 1.25" focusing tubes, and will not work properly while behind another prism or erecting diagonal.

For SCT Scopes w/ 1.25" Focusers    Requires 2 1.25" Eyepieces    Allows Two-Eye Viewing    Creates 3D Effect

Interpupillary distance adjustments do not cause focusing changes

Fully multicoated BaK-4 prisms

Eyepiece dioptric scales for sharp focus & easy resetting

Metal thumbscrews

Accepts 1.25" filters upon nosepiece-so only one filter's necessary, and changing eyepieces doesn't change the filter

NOT RECOMMENDED FOR EYEPIECES WITH FOCAL LENGTH LONGER THAN 25MM

Related Questions and Answers

Q: 1. Re-ask because got a weird response last time: Which adapter for the Nikon Action Extremes 10 x 50 and 8 x 40? Should I use TRA-3 Binocular Tripod Adapter OR TRA-2 Binocular Tripod Adapter? Thank you.

A: Both tripod adapters will work. The TRA-3 will give you a higher elevation than the TRA-2

Q: 2. Works with Aculon 10x50? It is not in the compatibility list. Thanks.

A: This would be the one to use for the Aculon 10x50 BH #NIMATA.

Q: 3. Is this compatible with Nikon 8x42 Monarch 5 (roof) binocular?

A: Yes, I bought it for my Monarch 8 x 42s. Works fine.

Q: 4. Will my Nikon 10x50mm binoculars fit onto this holder?

A: As long as the thread where the adapter screws into the binoculars is a 1/4" 20 thread yes they will be fine. It can be used to mount binoculars with up to a 56mm objective.

Q: 5. Does this work with the Nikon Laserforce Rangefinding Binoculars?

A: Yes it is compatible with the Laserforce binoculars.

Q: 6. What is the horizontal bolt through the vertical arm for?

A: Its used as a spacer, so the binocular tubes wont move.

Q: 7. Is this compatible with the Nikon 10x42 Prostaff 7S Binocular?

A: Yes. The adapter tends to loosen easily and the binoculars will not fit in the case with the adapter attached. It does work as advertised.

Q: 8. Will this adapter work with Nikon Prostaff 3S binoculars? Where does it attach to the binoculars? Thanks.

A: The Nikon TRA-3 Binocular Tripod Adapter, does not attach to the Nikon Prostaff 3S binoculars.

Q: 9. Did the rubber coating melt keeping them in the car?

A: Please contact Celestron's Technical Support Department for possible warranty servicing or replacement. You can reach them at: mail@celestronsupport.com

Q: 10. Will this work with the Celestron Skymaster 15x70, at minimum interpupillary distance, and without the "jello" shaking?

A: If you are referring to the Celestron 15x70 SkyMaster" Pro" Binoculars BH #CE15X70SMP • MFR #72030 the Nikon TRA-3 Binocular Tripod Adapter BH #NITRA3TA • MFR #8152 would be an appropriate tripod adapter. It will not work on the Celestron 15x70 SkyMaster Binoculars (Black) BH #CE15X70SM • MFR #71009 model.