Tele Vue Delos Eyepiece - Manual

Your eye pupil positioned
too far in or too far out will
cause edge darkening &
field loss.
Ideal match for your eye pupil
DELOS EYEPIECE INSTRUCTIONS
Thank you for purchasing a Tele Vue Delos eyepiece. Each Delos
model features 20mm of eye relief along with a 72° apparent field.
Based on our Ethos design experience, 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 Delos eyepiece is designed for optimum viewing
whether or not you wear eyeglasses. Our unique, new, adjustable,
locking eyeguard housing allows for full eye relief for eyeglass wearers
in the down position. Pulling the housing up will permit 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 position.
If you don’t wear eyeglasses, start with the eyeguard housing
pulled out all the way. To do so, grasp the upper rubber grip ring with
one hand. With the other hand, grasp the lower grip and rotate to the
left to loosen the assembly. Slide the eyeguard to the fully extended
position. While looking through the eyepiece, slide the eyeguard
down the barrel until you just see the full field with your peripheral
vision. Note your eyeguard height using the green indicator lines
engraved on the inner barrel. You may leave the eyeguard loose or
lock its position by again grasping the grip rings in each hand and
this time rotating the lower grip ring to the right. 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.
This eyepiece is ideal for using the Tele Vue DIOPTRX™ to com-
pensate for eyesight astigmatism. See reverse of page for details.
Delos effective field stop diameters:
Delos EFS (mm) Delos EFS (mm) Delos EFS (mm) Delos EFS (mm)
17.3mm 21.2 12mm 15.0 8mm 9.9 4.5mm 5.6
14mm 17.3 10mm 12.7 6mm 7.6 3.5mm 4.4
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.
The eyeguard housing is made of
two pieces. To loosen and move it,
grasp a grip ring with each hand
and twist the lower grip ring to the
left. When the eyeguard is suf-
ficiently loose you can slide it up
the barrel. To tighten, again grasp
both grip rings and twist the lower
portion of the eyeguard housing
Proper Eyeguard Positioning
32 Elkay Dr., Chester, New York, 10918 (845) 469-4551 televue.com
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