Product Details
When The ED81S was introduced , it set a new standard for 80mm APO Refractors. The combination of better color correction from the new ED glass and brighter images from its fast f/7.7 focal ratio will satisfy the most demanding visual astronomer or astro-photographer. The new ED glass produces clear and high contrast viewing, virtually free of false color. The design uses newly developed, environmentally friendly glass technolgy. The optical tube is very stable yet light weight. The top carry handle also includes a 1/2-20 stud for piggyback camera mounting. Vixen's new Dual Speed Focuser, now standard on the ED81, provides fine focus adjustments for 1/7th speed focusing.
ED81S Features:
Objective Lens: 3.2 in (81 mm)
ED Apochromatic, MultiCoated
Focal Ratio: f/7.7
Resolving Power: 1.43 arc sec., 11.3
Light gathering power: 134x
Adapter Thread/Visual Back 60mm, 42mm for T-Ring, 50.8mm
The ED81S comes complete with:
Dual Speed Focuser
90mm Tube Rings
Carry Handle
Dimensions: 90mm x 573mm/ 3.5 x 22.5in
Weight: 3.4 kg/ 7.5 lbs
