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Radian

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When I designed the original Nagler eyepieces in 1979, my goals were to get an extremely wide field with full field sharpness and comfortable eye-relief, all considered mutually exclusive properties. To realize this dream, I had to sacrifice size, cost and weight. Would amateur astronomers pay 10 times the cost of ordinary eyepieces to gain a "spacewalk" experience and dramatically improve telescope performance? Fortunately, the market agreed that a lifetime of viewing pleasure and ownership satisfaction would justify such an investment.

Fast forward to 1999. As the hobbyist population ages along with me, more and more amateurs need eyeglasses to correct astigmatism. Several companies have already borrowed the "Nagler" concept of integrating a "barlow" lens assembly with a longer focal length lens group to produce very short focal eyepieces with very long eye-relief to satisfy eyeglass wearers. It's now time for Tele Vue to revisit the trade-off of field versus eye-relief.

By limiting the field to 60 deg. (a Radian = 57.3 deg.) and establishing a uniform 20mm eye-relief, we reworked the Nagler concept using the latest glass types to achieve optimum full field sharpness, freedom from distortion, freedom from ghosting (for critical planetary viewing) along with a unique adjustable eyeguard assembly which we call "Instadjust."

Instadjust was developed from the need for proper eye position for non-eyeglass wearers. It is essential, since with Radian's long eye-relief, non-eyeglass wearers would easily tend to get too close to the eyepiece, resulting in vignetting the field, just as you would moving out from the exit pupil. The click-stop, Instadjust eyeguard permits fast, accurate positioning of the eye to the exit-pupil with maximum suppression of environmental stray light. Instadjust is topped off by a soft (for comfort and eyeglass protection) fold-down rubber eyeguard and protective cap.

Usual Tele Vue features such as full multicoating, blackened lens edges, parfocalization, and grip-ring complement the Radian line. With a reasonable size, weight and cost, I anticipate the Radians will set a new benchmark in viewing pleasure for any person and any target within the eyepiece focal length range of 3mm-18mm. 18, 14, 12, 10, 8mm models have just 6-elements. 6, 5, 4, 3mm have 7 elements.

I look forward to hearing your opinion on how close we came to the bull's eye. - Al Nagler

Precios para Radian

Los precios pueden variar sin aviso previo.
No incluyen gastos de transporte.

Las Características Técnicas estarán disponibles en breve.

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