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- #1 in Telescope Diagonals
Product Description
1.25in Diagonal
1.25in nosepiece 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
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.
Dennis R Price
Reviewed in the United States on February 5, 2025
No difference in quality when viewing direct and through this diagonal. Great value. No complaints.
Alex Smith
Reviewed in the United States on January 25, 2025
My first telescope only came with a 45 degree diagonal, this one is a nice upgrade. It seems solid and well made. The clarity and color are better than in the one that I had. Fit is nice and snug.The only complaint I have is really my own fault for not understanding the specs. This unit corrects the top/ bottom view, but not the left/right. Being a novice, this makes it a little more difficult for me to use.The price is very reasonable for what you get, but ultimately I will be looking to replace it at sometime because of the the left/right mirrored view.
T. Smith
Reviewed in the United States on January 23, 2025
This SvBony 1.25" dielectric diagonal is excellent. I've had several other brands of dielectric diagonals and this unit is as nice as any. The quaility of workmanship is very impressive. Highly recommended.
KenL
Reviewed in Canada on January 17, 2025
I've generally been happy with the various SVBONY items I have purchased. This diagonal seems well made, and does seem a bit brighter than older diagonals I have.
Jason Claggett
Reviewed in the United States on August 27, 2024
Built with solid materials, this diagonal exceeded my expectations. Great product, clear, crisp images - didn't notice any distortion.
Juan Manuel Berzunza Cuevas
Reviewed in Mexico on August 11, 2024
Muy práctico y de buena calidad.
Randall Reed
Reviewed in the United States on July 23, 2024
This diagonal was a great upgrade compared to the diagonal that came with the telescope. The build quality is impressive. The price is incredible for the quality Much clearer image. Lots more light in the eyepiece Would buy again or recommend. So far the Svbony products I have purchased have all been top notch
Customer
Reviewed in Mexico on July 22, 2024
Excelente producto, calidad superior, bonito diseño y color, llegó super rápido, gracias!!!!!
Jesus A.
Reviewed in Mexico on May 7, 2024
La diagonal esta a la par en calidad y funcionalidad de las grandes marcas del mercado, pero a un menor precio y sin perder gran detalle visual, producto excelente, ya arreglaron el problema que tenia de venir tintada de rojo en el interior
bbdd
Reviewed in the United States on January 9, 2024
I had a diagonal with my Meade 6 inch refractor along with a complete set of Meade series 4000 Plossl eyepieces. After reading about various degree of light transmission through diagonals, I decided to test the one I had. I looked through it at my computer desk which has wood veneer on it. The desk is brown color but through the existing diagonal it came out as mostly grey. Having purchased a diagonal finder from SVBONY and been happy with the product. I decided to pick this up which is about 1/3 of the cost of a similar diagonal from more well known companies. I took it out of the box and tested it against the desk and it is the same brown that the eye sees. Ironically a friend (who I bought the telescope from) found a 2 inch diagonal in a discount store for $5. He gave it to me. It was in its original box and looked brand new. It had no brand name or any other writing on it. I did the test on the desk and it and the SVBONY one both produce the same sharp, brown image.P.S. It was black inside and not red.
JimmyA
Reviewed in the United States on February 24, 2023
Bought this as I have a small f/5 modified scope with limited infocus travel. My premium diagonals have a longer optical path length and don't work in this scope. This SVBONY diagonal has a shorter path and will allow my eyepieces to focus. This is pretty decently made, although my use is not optically demanding (low power only) the difference in reflectivity when compared to a non-dielectric diagonal can be seen. This diagonal is marked "99% dielectric coated" which refers to the mirror reflectivity.The side plates on this diagonal are blackened on the inside. SVBONY may have corrected the design or the ones mentioned that are red on the inside slipped past quality control, which is spotty with China manufacturing.Hopefully the coating on this is more durable than a conventionally aluminized mirror, since at this price point it's not worth reconditioning. The mirror appears to be glued in place, so if the collimation is off it's not really fixable. Check it with a laser collimator in the eyepiece port and place a flat mirror on the telescope side, facing the mirror and collimator. The laser spot should reflect dead center on the collimator target. This particular diagonal checked out fine, but since the mirror is likely installed by hand it should be checked when you get yours.IMPORTANT: there are similar SVBONY diagonals with silver side plates that are described as Dielectric. If they are, the specified reflectivity is VERY LOW for a dielectric mirror. Most likely it's incorrect information, and that's why they are about $10 cheaper. Getting a straight answer out of China makers is hard because of the language barrier. I think those have the same metal parts with a conventional non-dielectric mirror.
Dan Sullivan
Reviewed in Canada on December 21, 2023
I didn't expect a 55$ diagonal to blow me away, but here we are. I recently purchased a Skywatcher 102mm StarTravel, the included 45 degree diagonal is perfectly usable for terrestrial, but for sky observing with objects high, it's much more of a problem. I was recommended this diagonal from a friend, and I was blown away with the difference in brightness and clarity of viewing. I have purchased a few SVbony products and they never fail to impress. This diagonal is no different. The mirror is huge compared to cheaper diagonals, and the dialectic coatings make it much brighter. If you need a diagonal buy this one with confidence. It comes with a brass band and not just a screw, so your eyepieces shouldn't get scratched up. Getting used to left and right being backwards, takes some getting used to, but it's definitely not a deal breaker. An unexpected side benefit, is the mirror is very easy to clean. (with a microfiber cloth) That was a problem with the default one that came with the scope.
Meggabah
Reviewed in the United States on October 31, 2023
If you have the basic diagonal that came with your telescope then get this one. Very bright image compared to the stock one. I love the over size knob on the eyepiece lock. Worked great with gloves on in winter. The compression ring was awesome as well. With those two features it makes this a great value and a good addition to your scope
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