Tele Vue-85 85mm, f/7, APO (Doublet) Refractor OTAAugust 19, 2020
Tele Vue-85 85mm, f/7, APO (Doublet) Refractor OTA
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|Focal Length (mm)||600|
|Focal Ratio (f/#)||7|
|Length OTA (inch)||19|
|Length with diagonal (inch)||21.9 (with 2-inch diagonal)|
|Weight OTA/Std. Config (lbs)||5.95 / 5.95|
|Drawtube/Focuser||2-inch, Focusmate dual-speed rack/pinion|
|Maximum Visual Field (deg.)||4.4 (with 2-inch 55mm Plössl)|
|Maximum Recommended Power (x)||225|
Tele Vue Small Doublet APO Refractors
For the Tele Vue-60, -76, and -85mm scopes, they met our goal to achieve apochromatic performance in as compact a package as possible. Since they could achieve the desired optical performance using a doublet design, including two more air-to-glass surfaces to create a triplet would have added additional weight in the wrong place, plus assembly and material costs with little performance benefit to the end-user. As you’ll notice from the specifications, as the aperture decreases the speed of each scope increases. The smaller aperture allows shorter focal length designs while retaining very similar optical performance between the three models.
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