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More Information  · Recommended Accessories Price $139.00 $179.00 SAVE: $40.00 (22%) List Price $250.00 Field of view 45° Eye Relief 20mm Focal Length 50mm Barrel Size 2" Weight 17.6 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

It provides an immense and wasteful 11.1mm exit pupil with an f/4.5 Dobsonian reflector. As the only observers whose eyes can dilate to this size are probably owls, this eyepiece would not be a sensible choice for fast focal ratio reflectors. It is better suited to the longer focal ratios of refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains than it is to reflectors with focal ratios shorter than f/8. If you have a long focal ratio 2" focuser scope, however, this is a terrific and inexpensive way to get the most out of it.

Its rubber-clad body gives a sure and comfortable grip in all temperature extremes. While its optical performance is quite good, almost on a par with more expensive longer focal length Plössls at two-thirds to three-quarters their price, this Vixen should be considered more for its virtue as a very cost-effective long focal length eyepiece, rather than for any special optical excellence.