Tele Vue Radian Eyepiece - Manual

Eyelens
Your eye pupil posi-
tioned too far in or too
far out will cause edge
darkening & field loss.
Ideal match for your
eye pupil
INSRADIAN -1198
RADIAN EYEPIECE INSTRUCTIONS
Thank you for purchasing a Tele Vue Radian eyepiece. Each of these new 1¼"
barrel models feature 20mm of eye relief along with a 60 degree apparent field.
Using a variant of the original Nagler design, we were able to keep the size and
weight down, while achieving the best sharpness, linearity (freedom from
pincushion distortion) and ghost suppression over the entire field for any speed
(f/#) telescope.
Your new Radian eyepiece is designed for optimum viewing whether or
not you wear eyeglasses. Our unique new “Instadjust” eyeguard housing allows
for full eye relief for eyeglass wearers in the down position. Pulling the housing
up will permit click-stop setting of the eyeguard height allowing for an ideal match
between your eye and telescope pupils. With this much eye relief available, it
is important to learn your own optimum “click stop” position.
If you don’t wear eyeglasses, start with the eyeguard housing pulled out all
the way. You can fold the soft rubber eyeguard up or down, whichever is most
comfortable for you. You may not see the full field with the eyeguard housing fully
extended; just keep “clicking down” until you find the most comfortable position
where you still see the entire field (this is much easier to do than to explain how,
thank goodness). You will also find that this system minimizes extraneous outside
light, giving you the highest contrast for those “faint fuzzies”. The generous
20mm of eye relief also minimizes eye lens fogging due to eye moisture in cold
weather. See reverse side for operation with pupil guide.
Following is a table of all Radian focal lengths and their corresponding
effective field stop diameters. To determine the true field in degrees for an
eyepiece on any given telescope, simply divide the field stop diameter of the
eyepiece by the focal length of the telescope (in mm) and multiply the
result by 57.3 degrees (a radian).
Warning: to avoid getting dust and dirt into the eyepiece, do
not unscrew the chrome barrel.
Extend eyeguard
by pulling up on
outer housing
Proper Eyeguard Positioning
Radian F.L. Field Stop Dia. Elements Weight (lbs.)
18mm 18.3mm 6 0.5
14mm 14.4mm 6 0.5
12mm 12.6mm 6 0.5
10mm 10.5mm 6 0.5
8mm 8.3mm 6 0.6
6mm 6.3mm 7 0.8
5mm 5.3mm 7 0.8
4mm 4.2mm 7 0.8
3mm 3.3mm 7 0.8
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32 Elkay Dr., Chester, New York 10918 (845) 469-4551www.televue.com
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