The 2" diameter barrel 100°-Series 20mm Eyepiece from Explore Scientific is an ultra-wide field telescope eyepiece designed for planetary and deep-space observations. Its wide exit pupil makes this eyepiece ideal for comfortable viewing for extended periods. The contrast is enhanced by a fold-down rubber eyecup that prevents stray light from leaking into your eye. Anti-reflective multicoated optics ensures bright, high-contrast images with true color transmission across the entire wide field of view. The eyepiece features a textured surface for a sure-grip when changing it out, argon-filled body for water and fogproof performance when used in extreme temperatures and climates, and a double-tapered barrel for smooth insertion and removal from the focuser.

20mm Focal Length    100° Field of View    2" Diameter Barrel    Fully Multicoated Optics    Argon-Filled, Water and Fogproof    Slip-Resistant Textured Surface    Easy-Insertion Double-Tapered Barrel    Fold-Down Eyecup

Ultra-wide 100° apparent field of view displays a broad image with minimal optical distortion, ideal for detailed observation

Images have true color transmission across the entire field of view, even as the observed object approaches the field stop.

Anti-reflective multicoated optics ensure bright, high contrast images

Wide exit pupil, long eye relief ensure comfortable long-duration observation through your telescope

Double-tapered barrel allows smooth insertion and removal from the telescope's eyepiece holder or diagonal

Fold-down eyecup prevents peripheral light from leaking into your eye, causing blurring and dimming of the image

Related Questions and Answers

Q: 1. I need to know 2 things: what is the maximum it is designed for ?[in pounds/ounces, or grams] (i have a suitable mount. Secondly, as I hope to retrofit this to an existing OTA, what is the minimum length when racked fully in?

A: This 2" Crayford Style Focuser from Explore Scientific is a dual-speed focuser that comes with the APO EDT series telescopes, and is sold here as a spare part or replacement. It is not intended for use with any other brand or model telescope.

Q: 2. What is the Outside Diameter of this focuser where it hooks to the telescope? Wanting to replace a bad focuser and need one 3.5" in diameter for the connection.

A: The Diameter of the Explore Scientific APO EDT Series Rack & Pinion Focuser (2") is 3 inches, so it won't fit a 3.5 ".

Q: 3. Does this fit on the ES 102mm?

A: Yes it is compatible with the Explore Scientific 102mm f/7 Essential Apochromatic ED Triplet Refractor.

Q: 4. The Sky-Watcher Evo 100ED and the Sky-Warcher 80ED both have Synta 96mm OT attachments for a focuser. Is this a 96mm focuser?

A: The Explore Scientific APO EDT Series Rack & Pinion Focuser (2") is not a 96" focuser.

Q: 5. Will this work with an Evostar 72 APO refractor?

A: Yes, the Explore Scientific Field Flattener for f/5 to f/7 Refractors is compatible with the Sky-Watcher Evostar ED APO 72mm f/5.8 Refractor.

Q: 6. Does this fit on Explore Scientific FirstLight 127mm f/15 Maksutov-Cassegrain Telescope ?

A: This will not work on the Scope you referenced.

Q: 7. Any front filter threads? If yes, what size?

A: There is no front filter threads in the Explore Scientific BT-70 SF Giant Binoculars.. In the instructions, Explore Scientific explains, the filters will be mounted in the 1.25" eyepiece threads.

Q: 8. What adapters or accessories should be purchased for attaching to a micro-4/3 camera (Olympus OM-D EM5 mark3)?

A: In order to adapt an M43 camera to the Explore Scientific ED80 80mm f/6 Essential Series Air-Spaced Triplet Refractor Telescope you would need these 2 parts: https://bhpho.to/4dUckfj plus https://bhpho.to/48hlWwL.

Q: 9. Can this be used on the Sky-Watcher Evo 100ED?

A: Yes this would be compatible with your Sky-Watcher EvoStar 100mm f/9 Doublet APO Refractor (OTA only).

Q: 10. I have a celestron SE8, and would like to know if this would be a good choice for deep space viewing, and what accessories I would need to make this work?

A: Sure, you would need to upgrade into this Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes BH #CEDM2S • MFR #93527 Being a 28 mm, the eyepiece would provide 72x . Note that the included 8se eyepiece is a 25mm, so in theory it would be similar to the magnification. Usually a much lower power is used, which would provide a wider view, like , Explore Scientific 62° Series 40mm LE Eyepiece (2") B&H # EXEPWP6240LE MFR # EPWP6240LE-01 or Tele Vue Plossl 55mm Eyepiece (2") B&H # TEEPL55P MFR # EPL-55.0