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SVBONY explores the universe with you
SV188P diagonal with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing
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
Brass Compression Ring
Brass lock Screw for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching.
SV135 fully multi-coated zoom plossl eyepiece zooms to any focal length between 7 mm and 21 mm - pick the better magnification for your subject. As a beginner; SV135 zoom eyepiece is good for starter astronomer!
7mm-21mm linear continuous zoom
Regarding the zoom action; it is stiff enough that you won't accidentally shift focal lengths; but it is also smooth enough that you can rotate it without holding the base of the eyepiece with your other hand
StarPathOne
2025-07-08 15:02:18
As an experienced astrophotographer, clarity in optics means everything. This diagonal from SVBony was a very pleasant surprise in both build quality and optical clarity. It is very close in performance to many higher end diagonals I've tried. This was exactly what I needed for showing friends and family views of star clusters, galaxies, and bright nebulas.The eyepiece is clear to about 95% of the edge (at least). The zoom is surprisingly clear throughout it's entire range. Build quality is very nice with a solid hefty feel. Would make a great all around zoom for star parties as well as backyard observing.The mirror in the diagonal was flawless from my first observations and fits on perfectly in my 102 Mak, my 8" SCT, and my 72mm refractor as long as I'm using the 1.25" adapter. The dielectric properties really make this diagonal shine, literally. I can see almost no falloff in transmission and zero internal reflections thanks to the blackened internal coatings.Considering the price, you are getting a top notch instrument with 99% reflectivity and fits a sweet spot between the ultra high priced versions that do not offer much more performance, and the bargain eyepieces that really do not offer enough detail and clarity. Would be perfect for a travel scope as well because it's light and packable, and comes in a nice package that is reusable. I would certainly recommend this for starting out in visual astronomy before moving up to the more expensive 2" optics.
Rami Turner
2025-06-14 13:44:39
The diagonal worked perfectly, and the interior was already blacked out. (I saw an earlier review that mentioned the interior wasn't blacked.) The zoom eyepiece worked just fine, too! Overall very pleased.
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