Explore Scientific - 100° Series - 9mm, 14mm and 20mm Nitrogen Purged Waterproof Eyepiece Set
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.
Each 100° Series Nitrogen-Purged Waterproof eyepiece is internally sealed and purged with inert, dry nitrogen gas to prevent internal fogging, stop the intrusion of fine particulates and fungus, and maximize the life of the internal coatings.
Like all Explore Scientific eyepieces, the lens elements of the 100° eyepiece are meticulously cleaned and aligned before being installed in their precision machined lens barrels. Each lens and lens grouping have EMD (Enhanced Multilayer Deposition) Coatings and are edge-blackened to eliminate light scatter and maintain image contrast. Contrast is further enhanced with baffles that mask and deflect unwanted stray light.
The 100° apparent field of this new 20mm Explore Scientific eyepiece is nearly 50% larger in area than an 82° field eyepiece. These eyepieces with their huge apparent field of view not only give the observer a panoramic visual experience, but they relax the eye so the observer can pay attention to subtle details for extended periods. With an apparent field of view that is close to the maximum for hyper-wide eyepiece design, objects are not only easier to locate, but for non-driven telescopes the object will stay in the field of view for a very long time before any adjustments need to be made.
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.
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.
The nine element optical system is designed for maximum field/medium power deep space use with telescopes having focal ratios down as low as f/4.
OPTIONAL FOCAL EXTENDERS (extra cost)
- Extends the effective focal length of the lens being used.
- Produces higher magnification for imaging and visual applications.
- Flatter field-of-view compared to standard barlows.
2x - 1.25" barrel (FE02-125)
3x - 1.25" barrel (FE03-125)
5x - 1.25" barrel (FE05-125)
2x - 2" barrel w/ 1.25" adapter (FE02-020)
|Eyepiece 1||9mm, 12.5mm eye relief, 1lb 5oz|
|Eyepiece 2||14mm, 14.5mm eye relief, 1lb 14oz|
|Eyepiece 3||20mm, 14.5mm eye relief, 2lbs 2oz|
|Eyepiece Apparent FOV||100°|
|Eyepiece Barrel Size||2" tapered, threaded for standard filters|
|Optical Coatings||multi-coated, blackened edges|
|Warranty||1yr, extendable to product lifetime|