WARRANTY REGISTRATION FORM

We sincerely thank you for your purchase and wish you years of pleasure using it!

Tele Vue Warranty Summary
Eyepieces, Barlows, Powermates, & Paracorr have a “Lifetime Limited” warranty, telescopes & accessories are warranted for 5 years. Electronic parts are warranted for 1 year. Warranty is against defects inmaterial or workmanship. No other warranty is expressed or implied. No returns without prior authorization.
Lifetime Limited Warranty details online: http://bit.ly/TVOPTLIFE
5-Year/1-Year Warranty details online: http://bit.ly/TVOPTLIMITED
Subscribe to our Blog for the latest Tele Vue news: https://bit.ly/TeleVueBlog
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Date (day/month/yr): ______/______/________ 2.0x 2in Powermate (PMT-2200)

32 Elkay Drive
Chester, NY 10918-3001
U.S.A.

Tele Vue®

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2-weeks of product purchase. Please include
copy of sales receipt that has your name, thedealer name, and product name.



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First______________________________________
Street Address

Cut out mailing address at left, tape to envelope,insert form & sales receipt in envelope and apply
sufficient postage to envelope.

How did you learn about this product?
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c Social Media/Magazine/Other(s):What made you decide to buy this and your comments after using the product?

______________________________________City
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Purchase Information
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THE TELE VUE POWERMATE CONCEPT- taming the Barlow to unleash its power
Thank you for purchasing a POWERMATE: 1¼" (2.5x or 5x) or 2" (2x or 4x).
I thought you might be interested in the development of this project:
Barlows amplify the power of a telescope. They can be considered "focal reducers"
for eyepieces, or "focal extenders" for objectives.
Terence Dickinson, in his Barlow test report in Sky and Telescope, July 1997, says: "Technology has erased theold objections. A modern Barlow will not degrade your telescope's optics. Anyone telling you otherwise is using
outdated information. Moreover, the highly regarded Nagler eyepieces and their clones have built-in Barlows,
ample evidence that the lens is not some detrimental intruder." Thanks, Terence, for laying the myth of thedegrading Barlow to rest.
Barlows do more than just increase magnification; they also retain eye relief (or in the case of long focal length
eyepieces, actually INCREASE eye relief). A high quality Barlow must be properly designed and manufactured
in order to avoid compromising a telescope's color correction and spherical aberration correction. The"invisibility" of Tele Vue's 2-element Barlows have been noted in test reports in the astronomy magazines.
Barlow lenses, regardless of the number of elements, have negative power that diverge field rays. If Barlows are
made too short or with too much magnification, the diverging rays can cause severe vignetting and image
degradation in eyepieces due to mismatched pupils. I had to go beyond the simple Barlow concept to achieve
the goal of a compact, high power, fully corrected image amplifier.
Enter POWERMATE: My approach yielded a 4-element parfocal, compact amplifying lens system.
POWERMATE consists of a negative achromatic doublet plus a positive "pupil-correcting" doublet. While it looks
and functions like a Barlow, your eyepiece will operate with pupil locations where the designer intended, avoiding
mismatch problems. POWERMATE optimally mates its power to your eyepiece. No additional “interface lens” isneeded, since POWERMATES have it built-in.
In addition to full multi-coating, POWERMATE includes other Tele Vue special touches such as a safety
undercut on the chrome barrel where practical (2x and 2.5x POWERMATES do not insert fully on certaindiagonals) and captive lock screws that can't fall out. Our 100% QC program at f/4 insures that POWERMATE
will add dramatic power (and NOTHING ELSE) to your favorite eyepieces. If, for example, you own a 22mm
Panoptic, you’ll have the power of an 11mm focal length eyepiece (with the 2x Powermate), an 8.8mm focal
length eyepiece (with the 2.5x POWERMATE), a 5.5mm (with the 4x POWERMATE), or a 4.4mm (with the 5xPOWERMATE)!
Both 1¼” POWERMATES are constructed to be parfocal with Tele Vue’s 1¼” 90º diagonal (often used in smallertelescopes) adding convenience not previously available with any Barlow. The 2.5x and 5x POWERMATE arethreaded for 1¼” filters.
I hope you enjoy your new POWERMATE. If you have any interesting experiences with it, kindly drop me a noteat your convenience.
For Dobsonian/Newtonian owners using Tele Vue’s Visual Paracorr coma corrector and a POWERMATE• 1¼" POWERMATES (2.5x or 5x): Insert the 1¼" POWERMATE into the Paracorr’s 2"-1¼" adapter and set theTunable Top at its highest position.
• 2" POWERMATES (2x or 4x): Insert the 2" POWERMATE into the telescope’s 2" focuser, then insert theParacorr into the POWERMATE.
Please note that using heavy 2" eyepieces with the 2x or 4x POWERMATE could result in size and weightcombinations which may make it difficult to achieve proper balance on smaller instruments.

NOTE: For 35mm photography or CCD imaging, POWERMATES are ideal
alternatives to "eyepiece projection". For 1¼" Powermates (2.5X & 5X), unscrew
the bottom portion of the black barrel, thread it onto the special Powermate 1.25”
T-Ring adapter and screw it into your camera’s T-ring adapter. For 2” 2X
Powermate, unscrew the chrome barrel, thread it into the special Powermate 2X
T-Ring Adapter, and screw it onto your camera’s T-Ring adapter. For 2" 4X
Powermate, unscrew top half of black barrel and thread on the 4X T-Ring adapter.

Clear skies,Al Nagler, CEOTele Vue Optics, 32 Elkay Drive, Chester, N.Y. 10918 (845) 469-4551
POWRMAT13.doc 9/24/2013

Choosing Your Eyepieces

by Al Nagler
CEO, Tele Vue Optics, Inc

MAGNIFICATION

Eyepieces determine your telescope’s magnification.
Magnification = telescope focal length ÷ eyepiece focal length
TRUE FIELD OF VIEW

Eyepieces also determine the true field you see in the sky. To calculate the true field of view that you will see (in degrees):
True field of view = (eyepiece field stop diameter ÷ telescope focal length) x 57.3
THE FIELD STOP AND APPARENT FIELD OF VIEW

The field stop is the metal ring inside the eyepiece barrel that limits the field size. It’s projected by the eyepiece so that it appears
as a circle out in space when you look through the eyepiece. The angular diameter of this circle is called the apparent field of view
(AFOV) and is a fixed property for each eyepiece design. For example, Plössl and Nagler Zoom eyepieces have an AFOV of 50º,Panoptics have 68º, Delos have 72º, Naglers have 82º, Ethos have 100º and the Ethos-SX eyepiece has 110º.
LOW-TO-MEDIUM POWER VIEWING

For low-power viewing of large objects, or to use your telescope as a low-power finder, use an eyepiece that delivers close to themaximum possible true field of view (note that for 1.25" eyepieces, the maximum field stop diameter is 27mm; for 2" eyepieces, it’s46mm). Then add eyepieces covering uniform increments in smaller field stops. For example, if your widest field eyepiece has a
40mm diameter field stop and you choose a decreasing increment diameter factor of 2 (which results in a 4x decrease in area size),
you’ll end up with eyepieces having field stop diameters of approximately 40mm, 20mm and 10mm. To further fill in withincremental steps, add eyepieces with approximate field stop diameters of 28mm and 14mm. Of course, avoid duplicating focal
lengths. For example, if you use a 31mm Nagler (with a 42mm field stop diameter), you would not need a 32mm Plössl (with a27mm field stop diameter).
In general, for each field stop size, choosing eyepieces with shorter focal lengths and larger apparent fields of view will allow you tosee more detail and fainter stars. In addition, you’ll have a smaller exit pupil to better match your eyesight.
EYEGLASSES AND EYE RELIEF

If you do not need eyeglasses to correct astigmatism, don’t use them when observing. If you wear
glasses to correct astigmatism, make sure they’re multi-coated, and try to choose eyepieces thathave at least 15mm to 20mm of eye relief, to minimize any field reduction (vignetting). However,
you will find that with small exit pupils such as 1mm or less, you probably will not need eyeglasses,and can therefore use eyepieces with less eye relief. You can use DIOPTRX instead of eyeglasses
for best performance, with Tele Vue eyepieces that accept this accessory.
EXIT PUPIL

The exit pupil is the image of the objective that is formed by the eyepiece. It’s where you place youreye to see the full field of view.
Exit pupil = eyepiece focal length ÷ telescope f/#
For reflecting telescopes, it’s best to avoid exit pupils larger than 7mm or smaller than 0.5mm. Refracting telescopes have no upper
limits on exit pupil sizes.
IMAGE AMPLIFIERS (Barlows and Powermates)

You can also choose a long focal length eyepiece with comfortable eye relief and use image amplifying lenses to increase power.
Tele Vue makes Barlows and Powermates (an improvement to the Barlow-type design) in magnification factors of 2x, 2.5x, 3x, 4x
and 5x.
PARACORR Type-2 (Parabola Corrector)

If you have a Newtonian or Dobsonian reflector that’s f/5.0 or faster, you should seriously consider using the Paracorr to eliminate
coma, so your full field eyepiece sharpness is not compromised. Paracorr also acts like a 1.15x image amplifier, so, for example, a1000mm f/4.5 scope becomes an 1150mm f/5.2 scope. Adjust your eyepiece focal length choices accordingly. Paracorr Type-2 isfor scopes as fast as f/3.0.
HIGH-POWER VIEWING

Once you’ve selected an eyepiece set based on field stop sizes, calculate the magnifications produced with your scope. For
planetary or double star observing, you’ll want an eyepiece in at least the 150x range. For determining maximum power, a goodrule of thumb is to use no more than 60x per inch of aperture for scopes with apertures up to 6". Higher magnifications may still bepleasing but will not likely reveal any additional detail. Realistically, the atmosphere will usually limit your planetary observing to a
maximum magnification of about 300x, no matter how large your telescope aperture.
Basically, you’ll be choosing low and medium power eyepieces by field stop increments to "frame" the subject, and high power
eyepieces by magnification increments (based on your scope’s aperture), to reach the optimum contrast and resolution for viewingplanets and double stars.
Check out www.televue.com for the following related articles: "Choosing Your Telescope's Magnification", “Eyepieces for SmallDobs” and “Determining When To Use Eyeglasses”.
For more individual advice on specific applications, you can always call Tele Vue at 845-469-4551
ChoosingYour…doc

Tele Vue Optics, 32 Elkay Drive, Chester NY 10918 845-469-4551

Rev: 10/17/2012

TELE VUE EYEPIECE SPECIFICATIONSTele Vue recommends choosing low and medium power eyepieces in ratios of field stop diameters. For example, factorsof 1.4 or 2.0. When choosing higher power eyepieces, use ratios of magnification.
Focal
Length(mm)Type

Product CodeApparent
Field (deg)554131352122271717

PlösslPanoptic
Nagler 5
Panoptic
Ethos
Nagler 4
Panoptic
Ethos
Nagler 4

EPL-55.0
EPO-41.0
EN5-31.0
EPO-35.0
ETH-21.0
EN4-22.0
EPO-27.0
ETH-17.0
EN4-17.0

50
68
82
68
100
8268
100
82

40
32
24
1316
1925
17.3
18.2
1013
1420
1115

PlösslPlösslPanoptic
Ethos
Nagler 5
Panoptic
PlösslDelos
DeLiteEthos
Nagler 6Delos
PlösslApollo
DeLiteEPL-40.0
EPL-32.0
EPO-24.0
ETH-13.0
EN5-16.0
EPO-19.0
EAP-25.0
EDL-17.3
EDE-18.2
ETH-10.0
EN6-13.0
EDL-14.0
EAP-20.0
EAL-11.0
EDE-15.0

4350
68100
826850
72
62100
82
7250
85
62

12131015911911Delos
DeLiteDelos
PlösslNagler 6DeLite
DeLitePlösslEDL-12.0
EDE-13.0
EDL-10.0
EAP-15.0
EN6-09.0
EDE-11.0
EDE-09.0
EAP-11.0

72
62
7250
8262625086874.7
673.7
58
4.5
53.5
3.5
43

Ethos
Ethos
DelosNagler 6Ethos SX
DelosDeLiteEthos SX
Nagler 6Plössl
Delos
DeLiteNagler 6Delos
DeLiteDeLiteETH-08.0
ETH-06.0
EDL-08.0
EN6-07.0
ETH-04.7
EDL-06.0
EDE-07.0
ETH-03.7
EN6-05.0
EAP-08.0
EDL-04.5
EDE-05.0
EN6-03.5
EDL-03.5
EDE-04.0
EDE-03.010010072
82
110
726211082507262
82
72
62
62

6-3

Nagler Zoom

ENZ-0306

Field Stop Dia.
(mm)

Eye Relief(mm)Dioptrx
ReadyPupil size in mm for various f/ratio telescopes
f/4.5
f/5.2
f/7
f/10
f/142" Eyepieces for Wide True Fields
46.0
46.0
42.0
38.7
36.2
31.1
30.5
29.6
24.3

38
27
19
24
15
19
1915
17

Y
YYYYYYYY

12.2
9.1
6.9
7.8
4.7
4.9
6.0
3.8
3.8

10.6
7.9
6.0
6.7
4.0
4.2
5.2
3.3
3.3

7.9
5.9
4.4
5.0
3.0
3.1
3.9
2.4
2.4

5.5
4.1
3.1
3.5
2.1
2.2
2.7
1.7
1.7

3.9
2.9
2.2
2.5
1.5
1.6
1.9
1.2
1.2

Y
Y
Y*
Y
N
Y*
N
Y
YY
Y*
Y
NYY

8.9
7.1
5.3
2.9
3.6
4.2
5.6
3.8
4.0
2.2
2.9
3.1
4.4
2.4
3.3

7.7
6.2
4.6
2.5
3.1
3.7
4.8
3.3
3.5
1.9
2.5
2.7
3.8
2.1
2.9

5.7
4.6
3.4
1.9
2.3
2.7
3.6
2.5
2.6
1.4
1.9
2.0
2.9
1.6
2.1

4.0
3.2
2.4
1.3
1.6
1.9
2.5
1.7
1.8
1.0
1.3
1.4
2.0
1.1
1.5

2.9
2.3
1.7
0.9
1.1
1.4
1.8
1.2
1.3
0.7
0.9
1.0
1.4
0.8
1.1

Y
Y
YN
Y*YYN

2.7
2.9
2.2
3.3
2.0
2.4
2.0
2.4

2.3
2.5
1.9
2.9
1.7
2.1
1.7
2.1

1.7
1.9
1.4
2.1
1.3
1.6
1.3
1.6

1.2
1.3
1.0
1.5
0.9
1.1
0.9
1.1

0.9
0.9
0.7
1.1
0.6
0.8
0.6
0.8

Y
Y
Y
Y*
Y
YY
Y
Y*
N
Y
Y
Y*
Y
Y
Y

1.8
1.3
1.8
1.6
1.0
1.3
1.6
0.8
1.1
1.8
1.0
1.1
0.8
0.8
0.9
0.7

1.5
1.2
1.5
1.3
0.9
1.2
1.3
0.7
1.0
1.5
0.9
1.0
0.7
0.7
0.8
0.6

1.1
0.9
1.11.0
0.7
0.9
1.0
0.5
0.7
1.1
0.6
0.7
0.5
0.5
0.6
0.4

0.8
0.6
0.8
0.7
0.5
0.6
0.7
0.4
0.5
0.8
0.5
0.5
0.4
0.4
0.4
0.3

0.6
0.4
0.6
0.5
0.3
0.4
0.5
0.3
0.4
0.6
0.3
0.4
0.3
0.3
0.3
0.2

1¼" Eyepieces for Wide True Fields
27.0
27.0
27.0
22.3
22.1
21.3
21.2
21.2
19.1
17.7
17.6
17.3
17.1
16.2
16.0

28
2215
15
1013
1720
20
15
1220
14
1820

1¼" Eyepieces for Medium Powers
15.013.8
12.7
12.6
12.4
11.7
9.6
9.1

20
20
20
10122020
8

1¼" Eyepieces for Higher Powers
13.9
10.4
9.9
9.7
8.9
7.6
7.5
7.0
7.0
6.5
5.6
5.3
4.8
4.4
4.3
3.2

15
15
20
1215
20
20
15
126
20
20
1220
20
20

1¼" Zoom Eyepieces for Medium and Higher Powers
50

5.1-2.6

NOTE: True Field in degrees = (Field Stop dia./Telescope Focal Length) X 57.3°

10N

1.3-0.7 1.2-0.6 0.9-0.4 0.6-0.3 0.4-0.2*Indicates additional Dioptrx Adapter required

As of January 2012, all Tele Vue eyepieces have a limited lifetime warranty.

Tele Vue®

Vi s i o n a r y32 Elkay Dr., Chester, New York, 10918 (845) 469-4551 televue.com