This Meade 4.5mm HD-60 eyepiece is the latest very high power addition to the renowned Meade Series 5000 eyepiece line. Its advanced six-element optical design uses premium-grade and exotic glass for the best possible performance and image brightness. It is super fully multi-coated, with blackened lens edges for enhanced contrast. The Meade 4.5mm HD-60 offers a large 60° apparent field of view that is flat and tack sharp right to the edge. In addition, there is as much as a 40% improvement in chromatic aberration levels and edge distortion over traditional Plössls.
Average seeing conditions will limit its usefulness with long focal length scopes due to the inherent high magnification of its 5mm focal length. Using it with a 2000mm 8" f/10 catadioptric, for example, will result in 444x (55x per inch of aperture) and a 0.45mm exit pupil (less than 1/50th of an inch across). Both of these figures are right at the rule of thumb limits for maximum magnification per inch of aperture and minimum exit pupil size for usable observing under good to very good seeing conditions for a reasonably experienced observer.
Eye relief is a long 17mm and a twist-up rubber eyeguard provides viewing comfort and improved contrast, with eyeglasses or without. Its 1.25" chromed barrel is threaded for standard 1.25” filters, and a shallow safety groove is machined into the barrel. This groove engages the thumbscrew or compression ring of your focuser or star diagonal to prevent the eyepiece from falling should the thumbscrew loosen accidentally during use.
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