Astronomy Binoculars
74304 BT81S-A
Vixen's newest astronomy binoculars deliver crystal clear, sharp views through its new optical design. Its lightweight body ensures that you can take it to any observing location.
The air-spaced doublet optics in this 81mm are magnesium fluoride coated to help reduce the effects of chromatic aberration.
Mounting the binoculars is a simple process as they come supplied with a Vixen dovetail mounting bar for use with equatorial or altaz mounts. The dovetail bar also has 1/4" thread sockets for use with conventional tripod panheads.
An optional altaz fork mount is available and allows the binoculars to be used on the optional SX-HAL130 or SXG-HAL130 tripods. These provide a stable but lightweight tripod base for this excellent "space binocular".
75835 BT125-A
The BT125-A binocular features a pair of 125mm achromatic objective lenses at f6.1 and 760mm focal length. As with the BT81S, the 45° angled eyepiece holders make for comfortable viewing of the night sky or of distant terrestrial objects. The individually-focused eyepiece holders accept 1.25" eyepieces.
Mounting options are the same as for the BT81-S.
| Model | BT81S-A | BT125-A |
| Objective lens | 81mm achromatic, magnesium fluoride coating | 125mm achromatic, multi-coated |
| Focal length (Focal ratio) | 480mm (f5.9) | 760mm (f6.1) |
| Resolving power, limiting magnitude | 1.43 arc sec., 11.3 | 0.93 arc sec., 12.3 |
| Light gathering power | 134x | 319x |
| Dimensions | L480 x W190 x H155mm | L630 x W360mm |
| Weight | 4.1kg (9lb) | 10.9kg (24lb) |
| Visual back | 31.7mm push fit | 31.7mm push fit |
| Eyepieces (optional) | NLV and LVW with 31.7mm are recommended excluding LV8-24 Zoom | NLV and LVW with 31.7mm are recommended excluding LV8-24 Zoom |
| Accessories included | Finder bracket shoe, carry handle & dew shields | Finder bracket shoe, carry handle & dew shields |
Note: The BT81S-A is not designed for viewing at high magnification. Use of eyepieces with focal length shorter than 10mm is not recommended. Eyepieces are not supplied as standard with the BT81S-A and BT125-A.
Optional Accessories
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78062 HF2 Fork Mount Provides an easy-to-use friction controlled altazimuthal mounting for the Vixen range of astronomy binoculars and other optical devices. The fork mount comes complete with a half-pillar to raise the binoculars to a comfortable viewing height. Fits onto the SX-HAL130 or SXG-HAL130 tripods. Requires the 73798 Mount Plate. Weight: 3.4kg Maximum loading weight: 13kg |
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73798 Mount Plate Required to allow the 78062 Fork Mount to be used with astronomy binoculars and any other optical devices which have a 1/4" screw thread socket. |
Please note: BT81S-A and BT125-A binoculars are available to special order only
