Large aperture, 81mm binoculars are great for viewing the night sky or as a terrestrial binocular for making the most out of a good view. The BT81-A is portable, so that it can be taken to a dark sky location very easily. The viewer has an option of attaching any LV or LVW eyepiece to give a wide range of magnifications.
- Optics: Multi Coated
- Fully multicoated for maximum light transmission
- Provide a spectacular view of comets and star clusters
- Aperture Ratio: F11.2
- Resolving Power: 1.45 arc seconds
- Light Gathering: 131x
- Real Field of View: 66 arc minutes
- Field of View: 1.6 degrees
- Exit Pupil: 2.2mm
- 80mm multicoated optics
See something odd?
Report it here.