SVBONY Telescope Eyepiece 15mm 66° Wide Angle Bundle with SV137 2X Barlow Lens SV188P Dielectric Mirror Star Diagonal, for Astronomical Observations

15mm focus length eyepiece. 15mm is a intermediate eyepiece fit for observing the lunar surface planets binaries and bright nebula interior. 4 Lenses in 3 Groups: Multiple group lens combination to improve optical performance; the eyepieces delivers sharp images with good color correction and contrast. 16mm eye relief: Generous 16mm eye relief allows comfortable viewing distance and lets eyeglass wearers see the entire field of view. Full multi coated optical and 4-elements in 3 groups allow more light pass through to the eyepieces thus providing a brighter sharper and higher contrast images. SV137 2x Barlow lens with metal body. Fully multi-coated lens provide a sharp view.It can double the power of any 1.25 inch telescope eyepiece. Ideal for high power observation. Fully multi-layer coating make image clearer; Cemented doublet optic structure reduce the chromatic aberration with the increase of magnification. The 2x barlow lens has M42x0.75mm external thread, which can connect the barlow lens with the camera through a T-ring for astronomical shooting.(T-ring sold separately). 2X magnification. Give your telescope eyepieces a 2x Barlow Lens. High magnification for eyepieces to see more details of the moon and other planet. Advanced achromatic 2x barlow lens set provides a cost-effective upgrade configuration option for astronomy beginners. 1.25in Diagonal fits telescopes with 1.25in focusers. Accepts standard 1.25” eyepieces, filters, Barlow lenses and other accessories with a 1.25in insert barrel. 90° Viewing Angle. For more comfortable overhead viewing through refractor and Cassegrain type telescopes. Upright Image. Correct upside down and left right reversed image. It will look like trying to read a sign in a mirror. Suitable for space viewing, for there is NO upside down or right side up in space.

• 66 degree ultra wide angle tlescope eyepiece; provides a relatively wide apparent field of view; offers a wide and immersive viewing experience suitable for a range of celestial observations; including planets; the Moon; star clusters; and nebulae
• 15mm eyepiece; medium magnification focal length; Ideal for viewing large deep sky objects in medium to short focal length telescopes; and also ideal for viewing lunar and planetary details in medium to long focal length telescopes
• Provides comfortable viewing;Using the 2x barlow lens with a longer focal length eyepiece lets you achieve the same high magnification view; but in most cases the eye lens will be much larger; helping to reduce eye strain and improve comfort
• Dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing
• 90 degree viewing angle; diagonal reflects the telescope’s light path 90 degree to provide a more comfortable viewing angle; best for observing objects overhead