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TeleVue 0.50 DIOPTRX Astigmatism Corrector

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Model
DRX-0050
Weight
0.25 kg
Our price:
£92.00
including VAT 20.00 % ( £15.33 )
Qty

F4B5

TELEVUE DIOPTRX™ 0.50

AVAILABLE ON BACK ORDER. USUAL ETA: 2-4 weeks.

Got astigmatism? Get the "cure".

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".

 

How to Choose DIOPTRX™ Models

Your prescription may look like this, with different numbers.

    SPHERICAL CYLINDER AXIS
Right Eye O.D. +1.50 -0.50 45
Left Eye O.S. -0.50 +1.50 135

Simply choose DIOPTRX™ to match the cylinder (astigmatism)  value of your preferred viewing eye. In the example above, you would choose 0.5 diopter model for your right eye and 1.5 diopter model for your left eye.

  • Ignore spherical and axis values.
  • Ignore all ± signs.

 

Pupil Size vs. Astigmatism

Maximum pupil size decreases with age and this decrease the visibility of astigmatism. Consult the following charts.

Eye Pupil Size vs. A... Eye Pupil Size vs. Age
Exit Pupil Size vs. ... Exit Pupil Size vs. Astigmatism Visibility
Note:
image...
 
Long Eye-Relief Tele Vue Eyepieces that Accept DIOPTRX™
Plössl 55, 40, 32mm
Radian all
DeLite all
Panoptic 41, 35, 27, 24*, 19mm* (*requires DEA-0001 adapter)
Delos all
Nagler Type 4 22, 17, 12mm
Nagler Type 5 31, 26, 20mm* (*requires DEA-0001 adapter)
Nagler Type 6 all*  (*requires DNA-6000 adapter)
Ethos all

 

Eyepiece Adapters for DIOPTRX™

These adapters convert eyepieces with small eyeguards to larger eyeguards, so DIOPTRX™ can be installed. Note that these eyepieces have shorter eye relief than others recommended for DIOPTRX™. To minimize any vignetting with DIOPTRX™, it's best to use these for deep-sky applications where your eye pupil is large.

Installation with DIOPTRX™ Adapter
image...
 
Notes for DIOPTRX™ Adapter Use with Bino-viewers
DEA-0001 Adapter
  • 24 & 19mm Panoptic
  • 20mm Nagler Type-5
When used for bino-viewers, you may encounter "nose relief" limitations because DIOPTRX™ reduces the normal eyepiece eye relief.
DNA-6000 Adapter
  • Nagler Type-6
When used for bino-viewers, remove DIOPTRX™, because limited "nose-relief" and eye-relief will prevent seeing the full 82° field. The new larger eyeguards are still fine for use with binocular viewers.

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