TeleVue Radian

More Information  · Recommended Accessories  · Images of Some Features Price $229.98 $250.00 SAVE: $20.02 (8%) List Price $295.00 Field of view 60° Eye Relief 20mm Focal Length 18mm Number of optical elements 6 Barrel Size 1.25" Weight 9 oz Warranty 5 years Telescope Eyepiece Formula To calculate the magnification and approximate actual field of view of this eyepiece on your telescope, enter the focal length of your telescope below and press the "Calculate" button. mm

With short focal length refractors, it’s a low power, very wide field eyepiece. With the 480mm focal length TeleVue Pronto, for example, it provides 27x, a 2.65mm exit pupil, and a huge 2.22 degree field that’s over four times as wide as the Moon. With its long 20mm eye relief, even those who must wear eyeglasses while observing will see the entire wide field of this eyepiece and the splendors it can hold.

It is also truly excellent for medium magnification lunar, planetary, and globular observing with long focal length refractors, reflectors, or catadioptric scopes.