SVBONY SV188P 99% Reflectivity 90-Degree Dielectric Mirror Diagonal
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Key Features
The dielectric coatings on the mirror surface ensure over 99% reflectivity, reducing light loss and providing bright, sharp images for enhanced astronomical viewing.
The 1.25-inch nosepiece fits 1.25-inch telescopes and accepts standard accessories such as filters, eyepieces, and Barlow lenses, while the 2-inch nosepiece works with 2-inch telescopes for larger accessories.
With a 90-degree angle, this mirror diagonal provides a comfortable, ergonomic viewing position, making it perfect for observing objects overhead during stargazing.
The diagonal corrects the upside-down image but reverses left and right, offering a natural view for most astronomical observations, perfect for planetary and lunar photography.
Equipped with a brass compression ring and thumbscrew, the adapter ensures secure, scratch-free adjustments, preventing eyepiece rotation and protecting your gear during use.
1.25inch
2inch
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SV188P 90 Degree Dielectric Diagonal for Refractor Telescope
Elevate your stargazing experience with the SV188P diagonal featuring dielectric coatings that provides over 99% reflectivity, significantly reducing light loss for brighter images.
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.
90° Viewing Angle
For more comfortable overhead viewing through refractor and Cassegrain type telescopes.
SV188P installed on the telescope
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| Brand | SVBONY | |
| Model Number | SV188P | |
| Size | 1.25inch | 2inch |
| Optical Design | Mirror Diagonal | Mirror Diagonal |
| Coatings | Dielectric | |
| Reflectivity | dielectric 99% coating for bright images | |
| Material | Aluminum Alloy | |
| Filter Threads | M28.5*0.6 | M48x0.75 |
| M4 Set Screws | Yes | |
| Outer Connection(Lens Sided) | Barrel 1.25inch | Barrel 2inch |
| Inner Connection(Lens Sided) | Thread M28.5x0.6 | Thread M48x0.75 |
| Inner Connection(Eyepiece Sided) | Clamp 1.25inch | Clamp 2inch |
| Reflection Surface | Dielectrically Coated | |
| Image Orientation | Erect Image, Mirror Inverted | |
| Thickness of Mirror | 11mm | |
| Net Weight | 125g / 4.41oz | 463g |
- There are many 1.25" star diagonals on the market. Many of them have a mediocre mirror quality with 90% reflectivity (10% loss) and a plastic body. The 1.25" diagonal by SVBONY stands for a high-quality alternative to those cheap parts. It offers excellent image and mechanical quality. There's no vignetting over the full 1.25" field. SV188P features sophisticated, Multi-layered dielectric coatings that provide an outstanding 99% reflectivity for maximum view brightness and sharpness;
- SV188P Diagonals provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor. When use the SV188P with Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope, you need a special adapter;
- Another advantage is the 1.25" nosepiece barrel is threaded to accept 1.25-Inch filters. Brass lock Screw and Brass Compression Rings feature more precision and prevent barrels or the surface of eyepieces from marring and scratching.
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