Tele Vue Delos Eyepiece User Manual
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 compensate for eyesight astigmatism. See reverse of page for details.
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 sufficiently loose you can slide it up
the barrel. To tighten, again grasp
both grip rings and twist the lower
portion of the eyeguard housing
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notices on new Tele Vue products.
Center Field
Edge Field
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.
Proper Eyeguard Positioning
Your eye pupil positioned
too far in or too far out will
cause edge darkening &
field loss.
Eyelens
Ideal match for your eye pupil
®
Tele Vue
32 Elkay Dr., Chester, New York, 10918 (845) 469-4551 televue.com
Visionary
Name
Street
City State Zip
Telescopes Currently Owned:
Delos Purchased:
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DIOPTRX™
DIOPTRX
Astigmatism correction
Your eyeglass prescription should look
SPHERICAL
CYL
AXIS
O.D.
(Right eye)
O.S.
(Left eye)
product code
(in diopters)
DRX-0025
0.25
DRX-0050
0.50
DRX-0075
0.75
DRX-0100
1.00
DRX-0125
1.25
DRX-0150
1.50
DRX-0175
1.75
DRX-0200
2.00
DRX-0225
2.25
DRX-0250
2.50
DRX-0300
3.00
DRX-0350
3.50
5) Keep the lens cap on, and clean as necessary, just as you would clean any other multi-coated optical glass surface.
Your telescope's focuser is used to compensate for your near- or far-sightedness; DIOPTRX™ compensates for your
astigmatism. These units attach and lock onto the tops of over 20 long eye-relief Tele Vue eyepieces to achieve the
sharpest full-field viewing possible. DIOPTRX™ models are available in ¼ to 3½ diopter (¼ steps from ¼ to 2½
diopters, then ½ diopter steps to 3½-diopters), and are rotatable for tuning to the best orientation. A series of engraved
letters on the barrel helps to monitor orientation. Simply choose the DIOPTRX™ model that matches your eyeglass
prescription for astigmatism. All lenses are multi-coated glass in anodized aluminum housings with rubber eyeguards.
Benefits of using Dioptrx over eyeglasses
1. You're more likely to see a sharper, higher contrast image, because:
A. The Dioptrx is always completely aligned to the eyepiece optics, eliminating aberrations from a decentered
mismatch of eyeglass power and astigmatic axis.
B. Dioptrx can be rotated to exactly compensate for the astigmatic axis angle in real time, since both head angle
and age can vary your eyesight astigmatic angle.
C. Dioptrx likely has better multi-coatings than eyeglasses, and certainly is better in transmission and reflection
reduction than uncoated eyeglass.
D. Dioptrx is more likely to be cleaner than eyeglasses, which may have scratches and smudges from constant
use and wear and tear.
E. Dioptrx allows seeing your normal maximum contrast that eyeglasses can diminish (remove your eyeglasses
and see how contrast improves in normal vision).
2. You're more likely to see the full field in 100° Ethos eyepieces because your eyeglasses are more limiting in
"effective eye-relief".
When attached to any of the following long eye relief Tele
Vue eyepieces, DIOPTRX compensates for your eyesight
astigmatism. Most of these eyepieces have long eye relief
for eyeglass wearers, so simply adding DIOPTRX to
replace your eyeglasses should leave you with comfortable
eye relief. DIOPTRX corrects astigmatism only, since
focusing compensates for your power correction.
Installation Instructions (Additional technical information is available on our website at: www.televue.com)
1) Pull off and save rubber eyeguard from eyepiece.
2) While holding lower engraved bottom ring of DIOPTRX with one hand, unscrew upper top ring (containing lens and rubber eyeguard) just enough so the assembly slips
over the eyepiece top.
3) While still holding the lower ring, re-tighten upper ring on DIOPTRX so it locks onto the eyepiece, then loosen it slightly so DIOPTRX is free to rotate. (Note: you can
leave it locked onto Radian and Nagler Type 4 eyepieces because rotation can be done using their “Instadjust” housing.)
4) Place the chart on the reverse of this page at a distance so you can view it through your telescope, using your DIOPTRX equipped eyepiece (or use an actual star field).
Focus at the center of the field and rotate DIOPTRX to optimize the astigmatism correction for the sharpest image you’ve ever seen. DIOPTRX is most effective with
large exit pupils. Hint for setting rotation: view a star slightly out of focus, and simply rotate DIOPTRX until star disc appears circular then focus normally.
Tele Vue Dioptrx, Your Prescription for Better Viewing
Delos all
Plössl 55, 40, 32mm
Radian all
Panoptic 41, 35, 27, 24*, 22, 19*mm
Nagler Type 4 all
Nagler Type 5 31, 26, 20*mm
Nagler Type 6 all*
Ethos all
*Indicated e yepieces require DEA or DNA adapters.
something like the example below. Your
DIOPTRX value should match the CYL
(cylinder) value for your preferred viewing eye.
If you require more than 3.5 diopters correction,
call Tele Vue (845-469-4551) for info on
“stacking” DIOPTRX
Every DIOPTRX includes
a rubber eyeguard and
lens cover
XX XX XX
XX XX XX
®
Tele Vue
32 Elkay Dr., Chester, New York, 10918 (845) 469-4551 televue.com
Visionary
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