The 1.25" diameter barrel Explore Scientific 16mm 68° Eyepiece 1.25"from Explore Scientific 16mm 68° Eyepiece 1.25"is a wide-field telescope eyepiece designed for detailed close and deep-space observation. It uses low-dispersion, high refractive index glass with anti-reflective fully multi-coated optical surfaces to ensure bright, high-contrast images with true color transmission across the entire wide field of view. Its wide AFoV and long eye relief makes this eyepiece ideal for comfortable viewing for extended periods with or without eye glasses. The contrast is enhanced by a fold-down rubber eyecup that prevents stray light from leaking into your eye. The eyepiece features a textured surface for a sure-grip when changing it out, and it is argon-filled for water and fog-proof performance when used in extreme temperatures and climates.

16mm Focal Length    68° Field of View    1.25" Diameter Barrel    Fully Multi-coated Optics    Argon-Filled, Water and Fogproof    Slip-Resistant Textured Surface    Fold-Down Eyecup

68° 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.

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

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

Related Questions and Answers

Q: 1. Will it work with Pentax PF-65 ED II (straight body) ?

A: Yes, it will

Q: 2. What magnification would this be on a 100mm m2 Celestron spotting scope?

A: 540mm focal length divided by 18mm eyepiece = 30x Sincerely, Garrett at Celestron

Q: 3. Can you use filters with this eyepiece?

A: Yes, The 1.25” insert barrel is threaded to accept filters.

Q: 4. If I buy this from B&H is the Celestron warranty valid in Canada?

A: Yes this warranty is valid to U.S.A. and Canadian customers who have purchased this product from an authorized Celestron dealer in the U.S.A. or Canada.

Q: 5. Can it be used with Celestron NexStar 8SE 203mm f/10 Schmidt-Cassegrain GoTo Telescope?

A: Yes, the Celestron X-Cel LX 7mm Eyepiece (1.25"), can be be used with the Celestron NexStar 8SE 203mm f/10 Schmidt-Cassegrain GoTo Telescope.

Q: 6. What is the diameter of the opening in the eyepiece 2.3mm that I can peek through? 2.3mm or ?

A: It is about 0.9 (23mm)

Q: 7. Is this eyepiece compatible with the ETX-60AT telescope?

A: I have checked the Meade Manual available online. The telescope uses the standard 1.25 eyepieces. I would imagine that standard eyepieces are capable of achieving focus since they talk about buying extra eyepieces. With a 60mm 350mm focal length the 25mm and 9mm eyepieces supplied with the unit produce 14 and 39 magnifications and a 5mm would produce 70 magnifications. From my early experience with a longer focus refractor a practical absolute maximum magnification is twice the diameter of the front lens in millimetres (that is 120), providing the optics are good. What I am saying is, Don't expect to just keep adding magnification - the image will become very faint and fuzzy. Besides at such very high magnification strange things happen. The very small exit pupil projects floaters etc and granular 'things' in your eye directly onto your retina overlaying the 'real' image and becoming very annoying.The 5mm X-Cel has a nice wide 60 degree field, and at 70 magnification high power should prove a very satisfactory complement to the 25mm and 9mm if the telescope lens quality and optical system is good.Because the magnification is higher, the image will be fainter so it is more likely that you will use it for Moon, Planets, and Double Stars. Also it will require more care to locate objects. Still it should prove a good choice for higher magnification use.As you see from the illustration it will be bulkier and heavier but a price must be paid for the wide field and good eye relief.

Q: 8. I have a Pentax 65 ED II spotting scope and Pentax SMC XW 10mm eyepiece. If I wanted a greater field of view, should I get a bigger eyepiece 20mm or smaller one 5mm?

A: Magnification in telescopes and spotting scopes is calculated by division. So a 20mm eyepiece will have a greater angle of view than a 10mm or 5mm.

Q: 9. Hi, is the top of the eye cup moveable from the position show in the photos on this page? Does anyonme know what distance of eye relief is possible withis range? Thanks

A: Eye Relief 16.0 mm Retractable Twist-Up Eyecup

Q: 10. Does anyone know if this eyepiece is usable with the DSLR camera adapter? I'm noticing the lenses that work with this are somewhat limited...

A: I don't think this is usuable with a camera adapter but I know that Baeder makes a line that allow that function