Explore Scientific

EXPLORE SCIENTIFIC 20MM 52 deg SERIES WATERPROOF EYEPIECE

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Your Price: $161.99
SKU:
EPWP5220–01
UPC:
811803030053
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Product Overview

Often considered the perfect mid-range focal length for most amateur telescopes, the 20mm on the ED127 at f7.5 produces a 1 degree true field of view. Perfect for the Messier Marathon, or running down the Herschel Catalog. The 20mm 52° Series is also a good selection for most binoviewers with its relatively small size and magnification range.

Explore Scientific Waterproof Eyepieces - Comfort, Quality, Value. The Explore Scientific 52° Series eyepieces are excellent flat-field multi-element oculars that can transform your visual astronomy experience. With an apparent field of view of 52 degrees, these eyepieces offer incredible value in a very nice eyepiece. Expect exceptional quality and value versus a comparably priced Plossl.

Another great benefit of these eyepieces is the excellent contrast and ease with which you can gaze, not directly at an object, but slightly to either side. This skill, called using averted vision, is especially helpful when observing faint objects, because using averted vision puts the image on a part of your eye that is more sensitive to light, allowing you to see fainter images.

Specifications

Item NumberEPWP5220–01
Focal Length20mm
Length71mm
Width43mm
Weight181.4 grams; 6.4 oz.
Barrel Size/Type1.25" O.D. / Double Taper
Eye Relief15mm
Field Stop Diameter:18.2mm
Coatings:EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
Lens Elements/ Groups5 Elements in 3 Groups; Edge Blackened
Filter ThreadFits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI)
WaterproofO-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
EyecupRemovable Flip-Down Style Soft Silicone Rubber
Lens CapsSlide-on Top and Bottom
MaterialsOptical Glass; Aluminum; Steel; Silicone Rubber
MarkingsLaser Engraved: Focal Length; Series; Serial Number; Brand

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