Explore Scientific 52° 20 mm Waterproof
Argon Purged Eyepiece
This Explore Scientific 52° 20 mm Waterproof Argon-Purged Eyepiece provides all the comfort, quality, and value you have learned to expect from Explore Scientific. The Explore Scientific 52° Series™ eyepieces are excellent flat-field multi-element oculars that will literally transform your visual astronomy experience to new heights. With an apparent field of view of 52°, this 20 mm focal length eyepiece offer incredible value in an unusually nice eyepiece. Expect exceptional quality and value versus a comparably priced Plossl.
This 20 mm focal length version of the Explore Scientific 52° Series™ eyepieces is best used when you wish to obtain a medium power (magnification) from your telescope, whatever type it may be. This 20 mm eyepiece is a convenient focal length for observing many celestial objects including the Moon and planets. It has a standard 1.25" barrel size, and a 15 mm eye relief, with a 19.4 mm field stop diameter and it has EMD coated optics for high contrast imagery. This Waterproof eyepiece from Explore Scientific is purged with Argon gas to prevent fogging even under extreme changes in temperature or environmental conditions.
The EMD coated optics used in this Explore Scientific 52° 20 mm Waterproof Eyepiece reduce internal reflections and provide a flat field image with high contrast. Another nice benefit of this eyepiece is the excellent image contrast and ease with which you can observe using averted vision. This skill, not looking directly at an object, but slightly to either side is especially helpful when observing faint objects. Using averted vision puts the image on a part of your eye's retina that is more sensitive to light, allowing you to see fainter images than you would by "looking directly" at the object.
|Description:||20 mm 52° Series Argon-Purged Waterproof Eyepiece|
|Focal Length:||20 mm|
|Eye Relief:||15 mm|
|Field Stop Diameter:||19.4 mm|