SVBONY SV188P 99% Reflectivity 90-Degree Dielectric Mirror Diagonal

SVBONY SV188P 99% Reflectivity 90-Degree Dielectric Mirror Diagonal

Name: SVBONY SV188P 99% Reflectivity 90-Degree Dielectric Mirror Diagonal
Brand: Svbony
SKU: F9171B
Price: 47.99 USD
Availability: InStock
Rating: 4.9 (47 reviews)

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Key Features

Dielectric Coatings for Optimal Light Transmission

The dielectric coatings on the mirror surface ensure over 99% reflectivity, reducing light loss and providing bright, sharp images for enhanced astronomical viewing.

Versatile Nosepiece Compatibility

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.

90-Degree Viewing Angle

With a 90-degree angle, this mirror diagonal provides a comfortable, ergonomic viewing position, making it perfect for observing objects overhead during stargazing.

Upright Image with Left/Right Reversal

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.

Brass Compression Ring for Secure Fit

Equipped with a brass compression ring and thumbscrew, the adapter ensures secure, scratch-free adjustments, preventing eyepiece rotation and protecting your gear during use.

Style: 1.25inch

1.25inch

2inch

In Stock

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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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