The Vixen Optics 2.5mm SLV 1.25" Eyepiecefrom Vixen Optics 2.5mm SLV 1.25" Eyepiecefeatures a 20mm eye relief with a twist-up eyecup for comfortable viewing with or without eyeglasses. Designed with seven elements in four groups, the fully multicoated optics minimizes light reflection for bright and sharp images. Its all-metal body has a 1.25" aluminum barrel, with an anti-roll rubberized grip.

2.5mm Focal Length    20mm Eye Relief    Fully Multicoated    Twist-Up Eyecup    Anti-Roll Body    7-Elements, 4-Groups    1.25" Aluminum Barrel

Related Questions and Answers

Q: 1. is this eyepiece good for long range birdwatching?

A: I use mine for astronomy with telescopes. But I think 20mm is going to be too wide for most long range birdwatching. For birdwatching I use a Swarovski 95mm spotting scope which has magnifications of 30x - 70x. This 20mm eyepiece only has a magnification of 31x with a 100mm scope. So I'd recommend a much shorter focal-length eyepiece than 20mm. Shorter focal-length eyepieces give greater magnification. So a 10mm might be better for long-range birdwatching. These eyepieces are very nice on telescopes. I assume they're very nice on spotting scopes too.

Q: 2. Hi. Could I attach this to a Nikon D500? If so how can I do it? Thanks.

A: No, this cannot be attached to a DSLR

Q: 3. 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: 4. will this work with a Nexstar 130 SLT?

A: Yes, it will

Q: 5. Is this eyepiece threaded at 42mm on the top to attach cameras like the XW eyepieces are?

A: The Pentax SMC 8-24mm Zoom Eyepiece (1.25") BH #PEEP2060X • MFR #70509 does no have any threads for additional add on.

Q: 6. I have a Polaris 114eq-d. Will this eye piece adapter work to convert it to 1.5?It has the 1.5 hole. Just don't know about the threads matching. Thanks

A: Yes, we are using this currently on the same model I believe. and it works great!

Q: 7. Will this work on an Meade ETX 70 focuser?

A: It will not.

Q: 8. 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: 9. Will it work with other brand t mounts?

A: Yes as long as the threading's are 42mm then it will work. That is correct.

Q: 10. Can you use filters with this eyepiece?

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