Explore Scientific 5.5 mm 100º Argon-Purged Waterproof Eyepiece - 2" - EPWP10055-01

Explore Scientific 5.5 mm 100° Waterproof 2" Eyepiece

The 5.5mm 100° Series™ eyepiece by Explore Scientific is part of an ultra-wide class of oculars that will revolutionize your astronomy observations. Enjoy the picturesque wide expanse of inky black sky you will see in the 100° Series eyepiece. The Explore 5.5mm 100º Eyepiece has over 10mm of eye relief. This Explore Scientific eyepiece is designed to increase the comfort level for long nights of observing as well as give you an amazingly immersive visual experience.

Another great benefit of hyper-wide eyepieces is the 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.

About the 100° Argon-Purged Waterproof Eyepiece Series from Explore Scientific

Optimized Optical Design Explore 100° Series hyper-wide eyepieces are optimized through each design, fabrication, and testing process to produce flat-field images that have high contrast and resolution.

Exotic Glass Combinations for Optimum Results Eyepieces are constructed of 8 or 9 lens elements (depending on the focal length) that are fabricated from combinations of Dense Crown, Light Crown, Dense Flint, and Lanthanum optical glass.

Durable Coatings & Finishing Touches Each element in your Explore Scientific 100° eyepiece is fully multi-coated, resulting in bright, sharp images, and every element has blackened edges to reduce internal reflections and increase contrast.

Waterproof, Fog-Proof Housing The internal optics of all 100° Series eyepieces are housed in a gas-purged, waterproof barrel that keeps them as pristine as the day they were manufactured. Cleaning is much easier, and there is no need to worry about water or fluid becoming trapped in between elements due to rain, spills, heavy dew, or getting over-enthusiastic with lens cleaning fluid.

Hyper-Wide Field Experience The 100° experience is different than that of more conventional eyepieces. A hyper-wide field of view means you can see more of the night sky at once, allowing you to observe larger or closer objects in their entirety, or to easily use inverted vision to capture faint photons of light. Also, those using Dobsonians or other instruments without a motor drive will enjoy watching an object drift more slowly across the field of view. Manually moving your telescope to compensate for the rotation of the Earth will be required much less frequently, and that's a good thing.

Tapered 2" Barrel for Extra Security The insert barrel of each eyepiece is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder or diagonal, however the wide dimension of the taper helps prevent the eyepiece from falling out of the telescope should the set-screw holding it in place become loose. The 2" barrel is threaded to accept standard screw-on filters.