Tele Vue engineered this medium focal length DeLite Series 13mm Eyepiece to produce a moderate magnification on most OTAs, and be as sharp and clear as their venerable Delos line, but smaller and more lightweight. The eyepiece features fully multi-coated optics that maximize light transmission and improve color and contrast across its entire wide 62° field of view. An exceptionally-long 20mm eye relief allows users to back off the eyecup for a more comfortable viewing experience with a greatly reduced risk of interfering vibrations caused by accidental contact with the eyepiece lens. The eyepiece is outfitted with their proprietary locking eyeguard which lets you set the eye relief in the perfect position whether you wear glasses or not. This DeLite has a barrel diameter of 1.25" to fit into the most common size focusers and accessories, and is parfocal with all Tele Vue Group 'B' eyepieces, allowing you to change compatible eyepieces without having to refocus - saving time and limiting vibrations.

13mm Focal Length    62° Field of View    1.25" Diameter Barrel    Fully Multi-Coated Optics    Proprietary Locking Eyeguard    Fold-Down Eyecup    Parfocal with Group "B" Eyepieces

• 8 - 32mm Plossl eyepieces
• All DeLite eyepieces
• 19 & 24mm Panoptic eyepieces
• 3.5 - 12mm Delos eyepieces
• 16mm Nagler 5 eyepiece
• All 1.25" Nagler 6 series eyepieces

Related Questions and Answers

Q: 1. Could I use this with my Meade 125 etc?

A: If your telescope has a 1.25 eyepiece opening then this eyepiece will work. To determine if your scope does I will need to know the exact Meade Model that you have.

Q: 2. How will this lens perform with 10” Dobson? (Celestron StarSense 10)

A: The Tele Vue Ethos 17mm Ultra Wide-Angle Eyepiece 2 inch is fully compatible with a 10 inch Dobsonian telescope.

Q: 3. What I feel that needs to be better explained about eyepieces and focal lengths as in 6mm or 25mm is that the opening is tiny for 6 mm as compared with 25mm that is wider . The lower the focal length the difficult it gets to train your eye throughthe opening due to its tiny opening. My child experience with my first kid telescope that came with 6mm and 25mm eyepieces told me that 25mm is more enjoyable to use despite lower magnification than the higher magnifying 6mm which is so restrictive in the opening for my eye to keep peeking through as steadiily as I can. I think that a minimum of 10mm is acceptable to me or maybe 12mm. . Am I correct?

A: Yes that is correct. 10 or 12mm will be okay. It also depends on how large of an aperture your scope has. The bigger front opening of the scope the brighter the image.

Q: 4. What's the condition of Ethos EP?

A: The USED Tele Vue Ethos 13mm Ultra Wide-Angle Eyepiece (1.25"/2") Used Cat #2699851 • MFR #ETH-13.0 Condition: 9 Minor surface marks Very good condition; overall looks clean but may have minor signs of use/surface marks. There are no scratches or blemishes to the optics.

Q: 5. Is this a good eyepiece and is it compatible with the Celestron Nexstar 105 GT telescope?

A: Televue Panoptics are excellent eyepieces. Very sharp, clear images. To determine if an eyepiece is compatible with your telescope you first need to calculate your telescope's Maximum True Field of View, then calculate the eyepiece's True field of View. Eyepieces that have a True Field of View greater than your telescope's Maximum True Field of View will cutoff the image and have chromatic aberrations around the edges. Generally speaking, it does not hurt to go a little over tFOV with quality eyepieces, but the more the eyepiece's tFOV is over the telescopes's max tFOV more of the image is cutoff and the worse the chromatic aberrations get around the edges.There are several very good free eyepiece calculators available on the web to calculate Max tFOV, and help determine eyepiece compatibility.

Q: 6. Is astigmatism an issue with Nagler zoom, which result in very small exit pupil dimensions? I hope not to wear eyeglasses, due to only 10mm eye relief on this zoom. Thanks.

A: As one can see reading the reviews on the Tele Vue Nagler Planetary 3-6mm Zoom Eyepiece (1.25"), there does not appear to be an astigmatism issue. Users with glasses say the eye relief works for them.

Q: 7. Good day,I got a Celestron NexStar Evolution 9.25 last week and from the reading it seems that it would benefit greatly from better eyepieces than the supplied stock ones.The telescope has Focal Length 2350 mm and Focal Ratio 10.I'm reading good things about the TeleVue Ethos.I was thinking about getting the Ethos 21mm. Would that be a good choice for my telescope?Also the Ethos SX 4.7mm, but maybe it would be too much power for my telescope? The supplied stock 13mm seems quite shaky as it is, using it from my apartment balcony.For the Ethos 21mm I would need 2 diagonal. Would TeleVue 2 Everbrite Diagonal - Satin be a good choice? Would it fit my telescope?Or maybe the Meade Series 5000 Dielectric Diagonal (2 ) as it seems to be supplied with Schmidt-Cassegrain to 2 adapter?Would there be a big difference between these two diagonals in the picture quality or not really on my telescope?What is the advantage of getting Ethos 21mm and Ethos 10mm versus Ethos 21mm and a 2x Barlow?Any advise/recommendations would be appreciated.Thanks.Regards,Andrej

A: I would personally go with the 21mm Ethos model. The 4.7mm will be overkill I think. You could still use it, but you would notice some shake for sure. I would go with the Meade 5000 Series for the Diagonal that would be a better choice. If you have any other inquiries like this please e-mail us at a href= http://sportoptics@bhphotovideo.com. target= _blank sportoptics@bhphotovideo.com./a

Q: 8. are the Delos series eye pieces par-focal?

A: Yes it is. This is parfocal with Tele Vue Group B eyepieces so no refocusing is required when switching between eyepieces within the group.

Q: 9. what is the percentage of distortion.....?

A: It would really all depend on the Telescope you have. Unfortunately I do not have that type of information, my apologies.

Q: 10. How will this lens perform with the Celestron 1100 CPC Goto?

A: @ 2800mm of Focal length on the C11 you would be off the chart at almost 600X magnification. Way too much. Televue recommends not higher than 350X magnification. So the 8mm version would fit the bill better.