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More Information  · Recommended Accessories  · Images of Some Features Price $640.00 Shipping $14.95 List Price $795.00 Field of view 82° Eye Relief 19mm Focal Length 31mm Number of optical elements 6 Barrel Size 2" Weight 35 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

The six-lens design uses multiple rare earth glass elements. Some of the lenses are actually over 70mm (2.75") in diameter, larger than the objective lens of the TeleVue Pronto telescope!

Please note the 35 ounce weight of this superb eyepiece, however. It may pose a balance problem with some Dobsonians when switching to the 31mm from a much lighter shorter focal length 1.25" eyepiece. Its use may require some temporary rebalancing of your scope, or the use of a TeleVue #TVEQC equalizing adapter with 1.25" eyepieces to avoid balance problems.

While easily the most expensive commercially-available eyepiece made, it is a surprising best-seller, particularly with owners of large premium-quality Dobsonians who swear by its huge exit pupil and "picture window on space" performance.