TeleVue 76 User manual

Operating Guide
32 Elkay Dr., Chester, New York 10918 [phone]. televue.com
TeleVue
®
Visionary
480mm f/6.3
2-ELEMENT APO REFRACTOR
Thank you for purchasing the Tele Vue- 76. We hope it brings great enjoyment to your observing ex-
perience. The wonderfully versatile hand-built 3” aperture telescope features a diffraction limited, 480mm
focal length, f/6.3 APO doublet objective which delivers razor sharp images sure to please you for years
to come and wherever you observing interests lead you.
WARNING: NEVER try to look at the sun or point the telescope toward or near the sun without
professional solar observing equipment rigidly secured in front of the objective lens. When
observing the sun with the proper filters, use only the Tele Vue “Sol-Searcher” (SSF-1006) for
finding the Sun. Remove any other finding devices such as Starbeam from the telescope. Instant
and permanent eye damage may result from viewing the sun directly, even during a solar eclipse, or when
viewing through thin clouds, or when the sun is near the horizon.
Standard features of the optical tube assembly (O.T.A.) include: sliding dew shield, screw-on cover, 2”
rack and pinion focuser with 10:1 reduction, and custom padded carrying bag.
Accessories
TV-76 Accessory Package - includes a 2” Everbrite diagonal, 2” to 1¼” adapter, Ring Mount, Telescope
Balance Adapter, and DeLite eyepiece.
Mounting - The optional Tele Vue Ring Mount (available separately or in the package) permits mounting
to the Tele Vue Gibraltar, Panoramic, and Tele-Pod mounts, or heavy duty camera tripods. You will receive
the two ¼-20 studs, wing knobs, Allen wrench and complete mount assembly instructions with the mount.
Tele Vue also has adapter plates to allow attachment on specific equatorial mounts (consult your Tele Vue
dealer). For use with heavy eyepieces or cameras, we suggest attaching the “Telescope Balance Aid” to
allow the scope to move forward.
Finders - For night use, we recommend the Starbeam reflex sight (SFT-2003) to complement the wide field of the
telescope. The Starbeam attaches to the Ring Mount and can be left in place when the scope is stored in its case.
Use the Qwik-Point (part # QBT-1006) for daytime spotting. It’s beam is bright enough for use in
even bright sunlight. However it is not recommended for nighttime use.
TeleVue -76
®

Terrestrial Viewing Considerations - The Tele Vue 55mm Plössl in a 2” diagonal will provide 9x with a
5.5° true field. This can serve as a finder, for rich field viewing or for terrestrial use. (Image is upright, but
left-right reversed using diagonal mirrors.)
Tele Vue developed the 1¼” 60° Everbrite Diagonal (part# DPC-6012) specifically for terrestrial
observers who appreciate the highest levels of image performance. The 60° angle is far more comfortable
for terrestrial observing than the standard 90°, and the 99% reflective Everbrite dielectric coating gives the
truest color rendition of any mirror or prism, and is sharpest at the highest powers.
For 1¼” diagonals and prisms, the 32mm Plössl or 24mm Panoptic offer the maximum field. 3.2°
at 15x and 20x respectively.
Getting Acquainted with the Tele Vue -76 (see photos on page 3.)
Note: O.T.A. purchasers must supply eyepieces, eyepiece adapter, diagonal, and ring mount in order for
the telescope to function. TV-76 Accessory Package includes these items.
1.1 Optical Tube Assembly
The OTA consists of the objective cell, tube and focuser. The front cell houses the carefully aligned objective.
Never attempt to loosen the 3 alignment screws in the front lens cell. The tube is aluminum and powder
coated, requiring no special care. The rack and pinion focuser is driven by high leverage knobs. The two
tension screws on the top of the focuser body can be adjusted to add resistance when using heavy eye-
pieces. These tension screws tighten against a brass clamp ring, which then cinches down on the teflon
sleeve in which the draw tube slides. For photography it is not necessary to tighten beyond the need to
keep a camera stationary. Even when sufficiently tight, the focuser knobs can still drive the draw tube.
The two lock screws in the end of the draw tube also tighten against a brass clamp ring for extra holding
power on the diagonal or other accessories.
1.2 Ring Mount
The Ring Mount included with the TV-76 Accessory Package permits easy telescope balancing. Simply
unlock the “bat handle,” reposition the telescope by sliding it fore or aft, and re-lock. Slots with 10-32
holes are available for mounting accessories.
1.3 Eyepieces
Tele Vue eyepieces offer a range of magnifications from 9x to 200x, with the Tele Vue-76 . We recom-
mend choosing low and medium power eyepieces in ratios of field stop diameters. For example, factors
of 1.4 or 2.0. When choosing higher power eyepieces, use ratios of magnification. (see reference chart
in the “Choosing Your Eyepieces” article). The TV-76 Accessory Package includes an 18.2 DeLite that
offers a 2.3° true field at 26x magnification with 20mm of eye relief.
1.4 Photography
For prime focus photography at 480mm f/6.3 using a DSLR, use camera adapter (part# ACM-2000).
For flat field astrophotography at 380mm f/5, use the Tele Vue 0.8x reducer/flattener, (part# TRF-2008).
Alternatively, the Tele Vue Powermates with optional T-ring adapters and our 3.5” extension tube provides
a variety of focal length options. Afocal photography using your cell phone camera is accomplished with
FoneMateTM (part# SFA-001). For Piggyback DSLR photography, attach the Piggy-Cam platform, (part#
PGC-1001) to the Ring Mount.
Mounting points are provided on top of the focuser body and draw tube for easy installation of the
Digital Micrometer Kits (part#s RMK-2002 or RMF-2003). These kits allow imagers to index focus posi-
tion to within 0.0001”, providing a very convenient way of finding best focus, returning to it, or checking
that it hasn’t changed. The dual speed focuser with its 10:1 focus reduction provides extraordinarily fine
focus adjustment for critical focusing. The Focusmate Driver (part# FDF-2004) adds hands free motor-
ized focusing. For installation, setup and use of the Digital Micrometer Kit and Focusmate Driver, see the
instructions included with each.

Lock Screws
*2” to 1¼” Adapter
*Eyepiece
Digital Micrometer Attachment Points
*Ring Mount
Bat Handle
Sliding Dew Shield
Focuser Tension Knobs
Focuser Knob
Draw Tube
*Diagonal
Front Cell and Alignment Screws (factory sealed)
Tube
Lens Cover
Accessory Channel
OTA Shown with optional TV-76 Accessory Package (TVP-3066*)
*Telescope Balance Aid
10:1 Reduction Knob

Tele Vue recommends choosing low and medium power eyepieces in ratios of field stop diameters. For
example, factors of 1.4 or 2.0. When choosing higher power eyepieces, use ratios of magnification.
NOTE: True Field in degrees = (Field Stop dia./Telescope Focal Length) X 57.3° *Indicates additional Dioptrx Adapter required
Tele Vue-76
Focal
Length
(mm)
Type Product Code Apparent
Field (deg)
Field Stop Dia.
(mm)
Eye Relief
(mm)
Weight
(lb.) Mag.
True
Field
(deg)
Exit
Pupil
(mm)
# of
Elem.
Dioptrx
Ready
2" Eyepieces for Wide True Fields
55 Plössl EPL-55.0 50 46.0 38 1.1 8.7 5.49 8.7 4 Y
41 Panoptic EPO-41.0 68 46.0 27 2.1 11.7 5.49 6.5 6 Y
31 Nagler 5 EN5-31.0 82 42.0 19 2.2 15.5 5.01 4.9 6 Y
35 Panoptic EPO-35.0 68 38.7 24 1.6 13.7 4.62 5.5 6 Y
21 Ethos ETH-21.0 100 36.2 15 2.3 22.9 4.32 3.3 - Y
22 Nagler 4 EN4-22.0 82 31.1 19 1.5 21.8 3.71 3.5 7 Y
27 Panoptic EPO-27.0 68 30.5 19 1.0 17.8 3.64 4.3 6 Y
17 Ethos ETH-17.0 100 29.6 15 1.6 28.2 3.53 2.7 - Y
17 Nagler 4 EN4-17.0 82 24.3 17 1.6 28.2 2.90 2.7 7 Y
1¼" Eyepieces for Wide True Fields
40 Plössl EPL-40.0 43 27.0 28 0.4 12.0 3.22 6.3 4 Y
32 Plössl EPL-32.0 50 27.0 22 0.4 15.0 3.22 5.1 4 Y
24 Panoptic EPO-24.0 68 27.0 15 0.5 20.0 3.22 3.8 6 Y*
13 Ethos ETH-13.0 100 22.3 15 1.3 36.9 2.66 2.1 - Y
16 Nagler 5 EN5-16.0 82 22.1 10 0.4 30.0 2.64 2.5 6 N
19 Panoptic EPO-19.0 68 21.3 13 0.4 25.3 2.54 3.0 6 Y*
25 Plössl EAP-25.0 50 21.2 17 0.3 19.2 2.53 4.0 4 N
17.3 Delos EDL-17.3 72 21.2 20 0.9 27.7 2.53 2.7 - Y
18.2 DeLite EDE-18.2 62 19.1 20 0.5 26.4 2.28 2.9 - Y
10 Ethos ETH-10.0 100 17.7 15 1.1 48.0 2.11 1.6 - Y
13 Nagler 6 EN6-13.0 82 17.6 12 0.4 36.9 2.10 2.1 7 Y*
14 Delos EDL-14.0 72 17.3 20 0.9 34.3 2.07 2.2 - Y
20 Plössl EAP-20.0 50 17.1 14 0.2 24.0 2.04 3.2 4 N
15 DeLite EDE-15.0 62 16.0 20 0.5 32.0 1.91 2.4 - Y
1¼" Eyepieces for Medium Powers
12 Delos EDL-12.0 72 15.0 20 0.9 40.0 1.79 1.9 - Y
13 DeLite EDE-13.0 62 13.8 20 0.5 36.9 1.65 2.1 - Y
10 Delos EDL-10.0 72 12.7 20 0.9 48.0 1.52 1.6 - Y
15 Plössl EAP-15.0 50 12.6 10 0.2 32.0 1.50 2.4 4 N
9 Nagler 6 EN6-09.0 82 12.4 12 0.4 53.3 1.48 1.4 7 Y*
11 DeLite EDE-11.0 62 11.7 20 0.4 43.6 1.40 1.7 - Y
9 DeLite EDE-09.0 62 9.6 20 0.5 53.3 1.15 1.4 - Y
11 Plössl EAP-11.0 50 9.1 8 0.1 43.6 1.09 1.7 4 N
1¼" Eyepieces for Higher Powers
8 Ethos ETH-08.0 100 13.9 15 1.0 60.0 1.66 1.3 - Y
6 Ethos ETH-06.0 100 10.4 15 1.0 80.0 1.24 1.0 - Y
8 Delos EDL-08.0 72 9.9 20 1.0 60.0 1.18 1.3 - Y
7 Nagler 6 EN6-07.0 82 9.7 12 0.5 68.6 1.16 1.1 7 Y*
4.7 Ethos SX ETH-04.7 110 8.9 15 1.3 102.1 1.07 0.7 - Y
6 Delos EDL-06.0 72 7.6 20 1.0 80.0 0.91 1.0 - Y
7 DeLite EDE-07.0 62 7.5 20 0.5 68.6 0.90 1.1 - Y
3.7 Ethos SX ETH-03.7 110 7.0 15 1.1 129.7 0.84 0.6 - Y
5 Nagler 6 EN6-05.0 82 7.0 12 0.5 96.0 0.84 0.8 7 Y*
8 Plössl EAP-08.0 50 6.5 6 0.1 60.0 0.78 1.3 4 N
4.5 Delos EDL-04.5 72 5.6 20 1.1 106.7 0.67 0.7 - Y
5 DeLite EDE-05.0 62 5.3 20 0.5 96.0 0.63 0.8 - Y
3.5 Nagler 6 EN6-03.5 82 4.8 12 0.5 137.1 0.57 0.6 7 Y*
3.5 Delos EDL-03.5 72 4.4 20 1.1 137.1 0.53 0.6 - Y
4 DeLite EDE-04.0 62 4.3 20 0.5 120.0 0.51 0.6 - Y
3 DeLite EDE-03.0 62 3.2 20 0.5 160.0 0.38 0.5 - Y
1¼" Zoom Eyepieces for Medium and Higher Powers
6-3 Nagler Zoom ENZ-0306 50 5.1-2.6 10 0.3 80.0-
160.0
0.61-
0.31
1.0-
0.5 5 N

1.5 Caring for the Tele Vue -76
Tele Vue- 76 requires no special care. Treat it as you would any fine camera lens. Use the lens cap
when the telescope is being stored or not in use. The captive dew shield provides protection from glare,
helps protect the lens from dust or spray blown in by the wind and minimizes dew formation on the lens.
If dew forms on the lens during cold weather, it is best to use an electric hair dryer (on the lowest
setting) to gently warm it away. A few specks of dust will have no effect on the quality of the image, and
may be gently blown off with a squeeze bulb. Do not use compressed air cans to blow dust off any opti-
cal surfaces.
Fingerprints, however should be cleaned off. Though the anti-reflection coatings are durable, they
are easily scratched. The simplest cleaning method is to moisten a very soft, lint-free tissue, cloth, “Q-Tip”
or surgical cotton with a lens or glass cleaner and gently whisk away the stain. Do not apply any solutions
directly to the glass surfaces. After every cleaning stroke, use a fresh applicator. The fewer strokes the
better! Any residual “film” will not affect visual performance.
Collimation of your Tele Vue- 76 has been locked at the factory. With reasonable care it will
remain aligned. However, rough handling can cause misalignment. WARNING: Do not loosen the but-
ton head screws in the front lens cell as this will cause misalignment. If necessary, contact Tele Vue for
re-collimation.
Our 90° and 60° star diagonals employ a first-surface mirror. Like all first-surface mirrors, they should
be cleaned only when absolutely necessary. First blow loose dust away with a squeeze bulb. CAUTION:
Do not clean mirror with water or water based cleaners such as Windex or any other commercial lens
cleaners; this is not a lens. All contain too much water and will leave a residue. Moisten a “Q-Tip” with
methanol or Isopropyl alcohol, reagent grade. Clean gently using only the weight of the cotton swab. Use
very light pressure and never rub. Slight residual stains or dust spots will have no visible effects in observing.
The tube and other parts are powder-coated for durability and can be polished with any non-abrasive
car wax. Black anodized surfaces can be cleaned with Windex.
If you have any questions about the care, operation or performance of your Tele Vue- 76, please call
Tele Vue at [phone] from 9:30 am to 5:00 pm EST.
1.6 Warranty
The Tele Vue- 76 is warranted to be free of manufacturing or workmanship defects for 5 (five) years
from the date of purchase, to the original owner. Please return the warranty card for easy identification. If
your Tele Vue- 76 requires warranty service, please call Tele Vue to discuss the defect, upon which you
will receive a return authorization. NO RETURNS ARE ACCEPTED WITHOUT PRIOR AUTHORIZATION.
The warranty does NOT include: collimation, defects caused by mis-handling, defects of subjective
nature, and coverage for any telescope purchased through an unauthorized Tele Vue dealer.
Warranty work will be performed at Tele Vue’s discretion and may only be performed by Tele
Vue Optics or its assigned agents. The telescope must be shipped in its case with proper inner and outer
packaging. Return shipping and insurance charges are the purchaser’s responsibility.