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Vixen BT81S-A Astronomical Observation Binoculars

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Model

X000002

Weight

6.00 kg

Our price:

£959.00
including VAT 20.00 % ( £159.83 )

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Vixen BT81S-A Astronomical Observation Binoculars

This 81mm astronomy binocular delivers 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".

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 BT-ED70S-A or BT81S-A.

Images are for demonstration purposes only. Fork mount and tripod are not included.

Model	BT-ED70S-A	BT81S-A
Objective lens	D=70mm F=400mm ED Apochromatic, multi-coated	D=81mm F=480mm Achromatic, single coating with Mgfl
Limiting magnitude	11.0	11.3
Light gathering power	100x	134x
Dimensions	L400 x W190 x H155	L480 x W190 x H155mm
Weight	4.0kg (8.8lb)	4.1kg (9lb)
Visual back	31.7mm push fit	31.7mm push fit
Eyepieces (optional)	SLV and LVW with 31.7mm are recommended excluding LV8-24 Zoom	SLV 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

Optional Accessories

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 SXG-HAL130 or SXG-AL130 tripods. (73798 Swing Bracket required for use with BT-ED70S-A and BT81S-A.)
Weight: 3.4kg
Maximum loading weight: 13kg

73798 Swing Bracket for HF2 Mount
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.

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PLEASE READ IT! IMPORTANT! COVID-19 and STOCK AVAILABITITY INFO:

Please note that currently we receive about 10 times more phone calls, 3-4 times as many emails, orders etc. whilst we work with reduced staff, so please be patient.

BRESSER, EXPLORE SCIENTIFIC, LUNT and VIXEN products: whilst we do stock some of these products, in many cases we would rely on the distributor's stock. Their warehouse is in Germany and currently the delivery times are about 7-10 days from there, although this is not exactly a promise. Brexit caused lots of problems and huge delays generally. We expect that it will take several months till the situation will improve.
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If you have an urgent inquiry, please call Zoltan on his mobile during working hours (Mon-Fri 9am-5pm)

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079 1278 4737 (international format: + 44 79 1278 4737)

Thanks for your patience!

Keep safe and healthy!

sidenote... TO THE ATTENTION OF OUR INTERNATIONAL CUSTOMERS!

EU CUSTOMERS: We have temporarily disabled European destinations whilst we adjust our system to the new VAT rules. Hopefully we'll be able to resume shipments to EU countries soon.

USA CUSTOMERS: shipping to the USA is active again, but we request customers to confirm product availability before placing an order! If you are ordering an MGEN-3, no need to check stock, we've got plenty of those. Please note, we will try to avoid sending goods via a postal service due to the huge delays and as DHL Express is more expensive than our system would currently charge for, we might have to charge extra depending on the value and size of the ordered goods.

Please note, due to the increased number if issues with postal services to most directions (especially Australia, Canada etc), we will only ship to these countries on the base of special request and depending on the value and size of the products. This is a temporary measure and we hope to supply worldwide again as soon as the situation improves.

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