With magnifying power of 28x and easy, both-eyes-open viewing, the Oberwerk BT-70XL-ED Binocular Telescope for Astronomyfrom Oberwerk BT-70XL-ED Binocular Telescope for Astronomyprovide a satisfying alternative to traditional telescopes for astronomical or long-range terrestrial observation. The BT-70XL-ED is built with broadband fully multicoated, extra-low dispersion objective lenses that minimize chromatic aberration or "color fringing" for a sharp view. Unlike a telescope, the optic is fitted with prisms that cause the image to be upright, so along with celestial objects, you can observe distant ships, breaching whales, mountain peaks, etc. The eyepieces are angled at 45° for comfortable viewing and the optical tubes have a large interpupillary adjustment range, so everyone from children to adults can enjoy the view. Binocular telescopes are far more portable than standard telescopes and do not require specialized mounts—an ordinary tripod with a 3/8"-16 or 1/4"-20 mounting stud will do, provided it is rated for an 8.5 lb payload.

Both-Eyes-Open Earth/Space Observation    14mm Eyepieces for 28x Magnification    Extra-Low Dispersion Objective Lenses    Full Broadband Multicoating    Nitrogen-Filled Fog & Waterproof    Wide 50-80mm Interpupillary Range    45° Angled Eyepieces    1/4"-20 and 3/8"-16 Mounting Sockets    Sturdy Aluminum-Frame Case

• Focal length eyepieces are 1.25" for 28x magnification to enable long-range terrestrial use or for lunar and planetary viewing.
• Objective lenses are 70mm to offset the dimming that is common with high-power optics during the day and to draw in the light required for astronomy use at night.
• Extra-low dispersion glass minimizes color fringing.
• Antireflection fully multicoated optics maximize light transmission for bright and clear images with accurate color rendition and improved contrast and clarity.
• The apparent angle of view is wide at 70° and the collimation is certified to 98x.

• The 45° angled eyepieces offer comfortable use.
• Large 50-80mm interpupillary distance adjustment range accommodates children and adults.
• The magnesium body is lightweight, waterproof, and nitrogen-filled.
• The picatinny rail handle allows attachment of accessories including finders or laser pointers.
• The optic has been tested and tuned to perfection prior to shipping.

Related Questions and Answers

Q: 1. ALL sites say the Esprit came with a 3 focuser, but B&H describe the focuser as been a 2 . which is correct? 2 or 3 ?

A: The focuser is 3.4 inches. The eyepiece size it uses is 2 inches.

Q: 2. Is it f/5.5 before or after the included field flattener?

A: f/ 5.5 is always a consent.

Q: 3. Do these binoculars have a locking diopter?

A: No locking diopter

Q: 4. Any front filter threads? If yes, what size?

A: The Vixen Optics 81mm BT81S-A Astronomical Binoculars do not have front filter threads.

Q: 5. Can I use multiple filters like IR cut filter, light pollution filter at the same time with this scope for astrophotogrphy?.

A: You might get some vignetting or stacking effect with using these filters at the same time. You can try it and see. It's really trial and error.

Q: 6. Would these be good for boaters & viewing over the water?

A: Yes they are Nitrogen Filled, Water & Fogproof

Q: 7. Does the findersscope come with an eyepiece with this scope. I can't tell by the pictures

A: The finder scope has an eyepiece the Sky-Watcher Esprit ED APO 100mm f/5.5 Refractor Telescope BH #SKE100EDAR • MFR #S11410 does not.

Q: 8. How much focus adjustment is there? I would like to mount a Z Cam with T-mount to shoot video.

A: In reviewing Vixen website I came up with no additional information

Q: 9. Where does it made from?

A: The GPO USA 10x42 Passion ED Binoculars are made in China.

Q: 10. Would these be suitable or good for boating viewing over water?

A: So these would somewhat work on Land. However on a Boat might not be the choice since there will be a lot of movement. I would recommend going with a 7X50 Binocular for the Boat. The Nikon 7x50 Action Extreme ATB Binoculars would be a great option. Link: https://bhpho.to/3m0rzas