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TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter

Item# TVU038
 
4.5

(9 Ratings)

Customer Q & A

Sale Price:

$314.98

List Price: $415.00
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  • Better choice than Barlows for 2-inch diagonals
  • Threaded to accept 48mm filters
  • 2-inch flat top adapter with brass clamp ring
  • Requires minimal refocusing
Details & Dimensions
Guarantee & Returns

What's Included?

Powermate

Description

Tele Vue 4x Powermate 2 Inch with 1-1/4 Adapter


These Powermates are a better choice for 2" diagonals than Barlows, since they are nearly Parfocal. They are threaded for 48mm filters and their performance is excellent with every 1.25" and 2" eyepiece we make (yes, even the 31mm Nagler Type 5!). Both the 2" eyepiece holder and the special 2" flat top adapter use our brass clamp rings for secure operation. And, it also has a very unique feature: you can unscrew the 2" eyepiece housing and screw on a special T-ring adapter for solid, compact attachment of CCD or camera equipment.


Excellent with long eye-relief, 2" eyepieces. Using the 4x model, imagine the quality of a 35mm Panoptic at 8.8mm with 25mm of eye relief! The Powermate is NOT a Barlow so the Panoptic-Barlow Interface is not needed! The 2" Powermate" fits all the way into 2" Star Diagonals, requiring minimal refocus compared to a 2" Barlow.


To understand the Powermate, we must first understand the Barlow lens. Barlows amplify the power of a telescope. They can be considered "focal reducers" for eyepieces, or "focal extenders" for objectives. Terence Dickenson, in his Barlow test report in Sky and Telescope, July 1997, says: "Technology has erased the old 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 Anyone telling you otherwise is using outdated information.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 the degrading Barlow to rest.


A high quality Barlow must be properly designed and manufactured in order to avoid compromising a telescope's color and spherical aberration corrections. The "invisibility" of Tele Vue's 2-element Barlows has been noted in test reports in the astronomy magazines. However, by the nature of its negative power lens, a Barlow will do more than just increase magnification, regardless of the number of elements.


The diverging rays leaving the Barlow result in moving the exit pupil further out, thereby extending the eye relief. In short to medium focal length eyepieces the change is not noticeable. However, in the case of long focal length eyepieces, the increase can be significant and not without performance consequences.


Vignetting can occur due to the altered ray path, when the eyepiece's lenses are not large enough in diameter to allow all the rays to make it through. Shorter Barlows, or ones with too much magnification, only exacerbate the problem because the ray path entering the eyepiece is steeper.


We had to go beyond the Barlow concept to achieve the goal of a compact, high power, fully corrected image amplifier. The Powermate" consists of a negative doublet plus a positive "pupil-correcting" doublet. This 4-element system provides the magnifying function of a Barlow without its limitations by restoring the field rays back to their original direction, as if the Powermate were not there. The result is a pure magnification increase.


Unique Benefits and Applications for Powermates


Vignetting, edge field aberrations and pupil movement - all introduced when using Barlows with long focal length eyepieces, are minimized.


Telecentric operation (field rays leave parallel to optical axis, unlike Barlow lenses which diverge rays). This is ideal for Hydrogen-alpha filter use such as with Daystar models.


High performance for image amplification, CCD or film (some of the finest Earth-based planetary imaging is being done with Powermates


Flexible for visual and imaging with all types of telescopes and eyepieces. Essentially Parfocal, and with nearly constant magnification regardless of image distance behind top surface (except 5x model which increases 1x for every 35mm of image distance increase).


Higher magnifications are possible with high optical performance compared to "doubling up" Barlows.


All will reach parfocal point in star diagonals, except for the 2", 2x which comes very close.


In addition to full multi-coating, Powermates include other Tele Vue special touches such as safety undercuts where practical on the chrome barrel and captive lock screws that can't fall out, and filter threads. Our 100% QC program at f/4 insures that Powermates will add dramatic power (and NOTHING ELSE) to your favorite eyepieces.


If, for example, you own a 24mm Panoptic, you'll have the power of a 12mm focal length eyepiece with the 2.0x Powermate, 9.6mm with the 2.5x Powermate, a 6mm with the 4x Powermate, or a 4.8mm with the 5x Powermate!


CHOKING HAZARD - small parts may pose a risk to children under 6 yrs.

Supplier Sku:
PMT-4201
Shipping Restrictions:
Only ships in contiguous USA.

Dimensions & Specifications

Brand

TeleVue

Telescope Accessories Series

Powermates

TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter
TeleVue 2x Powermate 2 Inch with 1-1/4 Adapter
$299.98
TeleVue 2x Powermate 2 Inch with 1-1/4 Adapter
TeleVue 2.5x Powermate 1-1/4 Inch Barlow Lens
$199.98
TeleVue 2.5x Powermate 1-1/4 Inch Barlow Lens
TeleVue 2x Barlow Lens 1-1/4 Inch
$125.00
TeleVue 2x Barlow Lens 1-1/4 Inch
Meade #126 2x Short-Focus Barlow Lens 1.25 Inch for ETX Model Telescopes
$38.98
Meade #126 2x Short-Focus Barlow Lens 1.25 Inch for ETX Model Telescopes
TeleVue 5x Powermate 1-1/4 Inch Telescope Eyepiece
$199.98
TeleVue 5x Powermate 1-1/4 Inch Telescope Eyepiece

The Perfect Accessories

Customer Reviews

REVIEW SNAPSHOT®

by PowerReviews
TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter
 
4.4

(based on 9 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

88%

of respondents would recommend this to a friend.

Pros

  • Great optics (6)
  • Strong construction (5)
  • Widely compatible adapter (4)
  • Easy to use (3)

Cons

  • Heavy (4)

Best Uses

  • Astronomy (6)
  • Astrophotography (3)
    • Reviewer Profile:
    • Casual/ recreational (8)

Reviewed by 9 customers

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Displaying reviews 1-5

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5.0

Fine product, fine service

By orb

from gloucester, ma

About Me Casual/ Recreational

Verified Buyer

Pros

  • Great Optics
  • Strong Construction
  • Widely Compatible Adapter

Cons

    Best Uses

    • Astronomy
    • Astrophotography

    Comments about TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter:

    I will use it for small planet astrophotography

     
    5.0

    Great Quality at a Fair Price.

    By Gar Grim

    from Hutch, KS

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Easy To Use
    • Great Optics
    • Strong Construction

    Cons

    • Focus Turned All Way Out
    • Heavy

    Best Uses

    • Astronomy

    Comments about TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter:

    The Product Worked Great other than the Fact I had to Turn the Focus All the Way Out to Make it Work.

    • Was this a gift?:
    • Yes

    (1 of 1 customers found this review helpful)

     
    5.0

    Teleview Powermate Excels

    By Steve E

    from Reisterstown, MD

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Great Optics
    • Strong Construction
    • Widely Compatible Adapter

    Cons

    • Heavy

    Best Uses

    • Astronomy

    Comments about TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter:

    Does everything it was advertised to do and more ... has extended the capabilities of my scope and allows me to use long fl wide fov eyepieces for high-power observing

    • Was this a gift?:
    • Yes

    (0 of 4 customers found this review helpful)

     
    1.0

    Not what I had hoped for

    By gemtag

    from Houston, TX

    About Me Casual/ Recreational

    Verified Buyer

    Pros

      Cons

        Best Uses

          Comments about TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter:

          I bought the powermate at the same time I bought the Televue 13mm. No matter what combination I tried the powermate with it always blurred and darkened. Despite other reviews touting this as superior to the barlow, my 2x barlow works much better.

          • Was this a gift?:
          • No
           
          5.0

          Powermate Update

          By 2 BIL

          from Bay Area

          About Me Casual/ Recreational

          Pros

            Cons

            • Heavy

            Best Uses

              Comments about TeleVue 4x Powermate 2 Inch with 1-1/4 Adapter:

              The 40mm I have will not work on my scope with the Powermate - too heavy. Loving the 2" views - when they are available! Don't forget an Ethos!

              Displaying reviews 1-5

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