TeleVue Eyepiece Radian 4mm $240.00,Free Shipping,  Televue ERD-04.0,Telescope Accessories Accessories, On Sale
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TeleVue Eyepiece Radian 4mm
MSRP: $290.00
Sale Price: $240.00
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TeleVue Radian 4mm Eyepiece

Item No. 704-13504
Manuf. No. Televue ERD-04.0

Free Shipping (within the 48 contiguous US States only)

Instadjust was developed for maximizing contrast while aiding in proper eye positioning for non-eyeglass wearers. It is essential, since with the Radian's long eye-relief, non-eyeglass wearers could easily get too close to the eyepiece, resulting in vignetting where edge field rays miss your pupil. The push-pull, click-stop adjustment permits fast positioning and maximum suppression of environmental stray light.

Another unique development is the Pupil Guide. It helps non-eyeglass wearers, especially novices, zero-in and stay centered on the exit pupil. The Pupil Guide is included with all Radian and Nagler Type 4s and fits under the soft, fold-down rubber eyeguard.


  • Type: Radian
  • Model: ERD-04.0
  • Focal Length: 4 mm
  • Barrel Size: 1.25"
  • Apparent Field of View (deg.): 60
  • Eye Relief (mm): 20
  • Weight lb/oz: 0.76 / 12.1

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