Explore Scientific 5.5mm 100 Degree Eyepiece - 2"

ITEM #
ES-EPWP10055-01
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  • Focal Length: 5.5mm
  • Barrel Sixze: 2"
  • Apparent Field of View: 100 degree
  • Eye Relief: 12.5mm
  • Waterproof: Yes, Nitrogen-Purged

 

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  • Regular price $449.99
  • $329.99
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Explore Scientific 5.5mm 100 Degree Eyepiece - 2"

The Explore Scientific 100 Degree Series eyepieces are hyper-wide class oculars that can transform your visual astronomy experience. You may be startled at the amazingly wide expanse of inky black sky you behold the first time you bring your eye to a 100 degree Series eyepiece, and after awhile, you may even forget that you have an eyepiece between you and the universe! 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.

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.

Explore Scientific 100 degree Eyepiece Highlights

Optimized Optical Design Explore 100 degree 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 degree 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 degree 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 degree 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.

Optional Focal Extenders for Extra Magnification Explore Scientific makes a wide variety of eyepiece focal lengths, allowing a change in magnification for just about any observational study you can think of. However, if you would like to get "double duty" out of the eyepieces in your accessory case, while still retaining the eye relief of that eyepiece, use Explore Scientific Focal Extenders.

 

 

OPT Product Number: ES-EPWP10055-01 

SPECIFICATIONS

Dust Caps IncludedYes
Eye Guard IncludedYes
Eyepiece Apparent FOV100 degrees
Eyepiece Eye Relief12.5mm
Eyepiece Focal Length5.5mm
Eyepiece Special FeatureWaterproof
Free ShippingYes
ManufacturerExplore Scientific
ModelExplore Scientific 100 degree Waterproof
Optical DesignWide Angle
WarrantyLifetime Warranty

INCLUDED ITEMS

  • 5.5mm 100 Degree Eyepiece

 

 

Customer Reviews

5 Based on 3 Reviews
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A
01/10/2019
Anonymous
United States

Explore Scientific 5.5mm 20mm 100 degree 2" eyepieces

Due to an unusually warm several days in January, I was actually able to test both of these eyepieces in my 115mm triplet APO telescope, as well as compare them against my 13mm Ethos and 31mm Nagler. The actual viewing was done on one single evening and was not an extensive several-hour test. This limited the number of objects observed to a fairly few and included the Orion nebula, some of the bright stars of Orion, the Pleiades cluster and various other stars. Since neither the moon nor any planets were visible during my brief observing session, this report does not cover those type of observations. However, based on my very cursory observations of the mentioned objects, the ES eyepieces appeared to be the equal of the 2 TeleVues in all respects- sharpness across the whole field, fit and finish, etc. Experience with OPT was first class, as usual.

A
01/10/2019
Anonymous
United States

Explore Scientific 5.5mm & 20mm 100 degree 2" eyepieces

Due to an unusually warm several days in January, I was actually able to test both of these eyepieces in my 115mm triplet APO telescope, as well as compare them against my 13mm Ethos and 31mm Nagler. The actual viewing was done on one single evening and was not an extensive several-hour test. This limited the number of objects observed to a fairly few and included the Orion nebula, some of the bright stars of Orion, the Pleiades cluster and various other stars. Since neither the moon nor any planets were visible during my brief observing session, this report does not cover those type of observations. However, based on my very cursory observations of the mentioned objects, the ES eyepieces appeared to be the equal of the 2 TeleVues in all respects- sharpness across the whole field, fit and finish, etc. Experience with OPT was first class, as usual.

S
03/13/2014
Santa_Fe_Ranger

Initial Impression Very Good !

Haven't had a chance to use this new 5.5 mm Explore 100 deg eyepiece under ideal condtions yet, but first impressions are very good. First light was under average seeing, and moonlit sky. Scope was a 12.5" Obsession Dob, 1600mm focal length, f/5, (approx 292x) with a variety of targets including several doubles and the Trapezium in M42. E & F stars in Trapezium were clearly visible, etc. In comparison to an Ethos 13mm (approx 138x with Paracorr), which serves as my reference eyepiece with this scope, the 5.5 Explore held its own very respectably considering the seeing conditions and higher power. Didn't notice any objectionable chromatic aberration, kidney beaning, flare, or other issues. I was concerned about edge sharpness, and I was pleased that stars were reasonably sharp to the edge of the field (no paracorr used with this focal length). No noticeable coma. Eye relief was not an issue for me (I don't wear glasses though). Considering the price (value for money), the convenience of having a high power eyepiece with a 2" barrel, and the impressive performance (at least during my first light experience), I think it merits a 4.5-5 star rating.