Designed with a fully multicoated 8-element/5-group lens configuration, the Celestron Ultima Edge 18mm Flat Field Eyepiece 1.25"produces bright and clear views with crisp and sharp resolution across the wide 65° field of view—even at the extreme edges. The eyepiece's focal length produces a medium magnification that strikes the delicate balance between being able to see details without the appearance of distracting vibrations that can ruin a view. This Ultima Edge has a 1.25" barrel that makes it compatible with popular diagonals, Barlows, and visual backs with standard threads for filters. This version is parfocal with the 10mm and 15mm models in the Ultima Edge series, requiring little or no refocusing when changing between them. A textured collar makes inserting and removing the eyepiece easy, and the combination of long 20mm eye relief and fold-down rubber eyecup make it comfortable to use with or without eyewear.

18mm Focal Length    8-Element/5-Group Lens Design    Wide 65° Field of View    1.25" Diameter Barrel    Fully Multicoated Optics    Parfocal with 10mm & 15mm in Series    Slip-Resistant Textured Surface    Fold-Down Eyecup

Related Questions and Answers

Q: 1. Will this work with the Celestron 52257 Ultima 100 spotting scope and will it be an improvement?

A: This Scope does not accept Telescope Eyepieces. My apologies. This will not work.

Q: 2. will this work with a Nexstar 130 SLT?

A: Yes, it will

Q: 3. I read that these eyepieces are parfocal, except for one. Which one would that be?

A: Parfocal with All X-Cel LX Eyepieces

Q: 4. Is the eye cup removable and is there thread under the eyecup?

A: No, the eye cup is not removable and there is no threads. Sincerely, Garrett at Celestron

Q: 5. Dear i heave telescope skywatcher p250 quattro-10 and iready pay this eyepiece but it is not clear i dont now whay???

A: Dear Qassem, Please contact our Technical Support Department, so a representative can speak to you and help to troubleshoot the issue which could be caused by a variety of different reasons such as optics in need of collimation, scope needing cool down, etc. You can reach our Technical Support Department by submitting a ticket at: https://www.celestron.com/pages/technical-support Sincerely, Garrett at Celestron

Q: 6. 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: 7. 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: 8. Does it work with celestron 127 slt ?

A: Yes the Celestron 8-24mm Zoom Eyepiece (1.25") is compatible with the Celestron 127SLT telescope.

Q: 9. 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: 10. Can this be used with Celestron 102 AZ telescope ?

A: Yes, the Celestron X-Cel LX 7mm Eyepiece (1.25"), can be used with the Celestron 102 AZ telescope.