- Dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing
- 1.25 inches nosepiece fits 1.25 inches telescopes; accepts standard 1.25in filters; eyepieces; Barlow lenses and other accessories with a 1.25in insert barrel
- 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
- Correct upside down and left right reversed image; the view image is upright; but left and right reversed if use the 90 degrees to your telescope
- Brass compression ring; Built in brass ring and thumbscrew accessories avoid eyepiece to rotate during adjustments; effortless fixes more firmly and will not scratch your eyepieces barrels
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.
Comparison
![]() SV221 90 Degree Diagonal |
![]() SV154 1.25inch Eyepiece |
![]() SA410 Tripod SA409 Fluid Head |
|---|---|---|
Feature 1Enhanced aluminum die |
Feature 1Super wide field of view |
Feature 1360 degree rotation |
Feature 2Internal extinction design |
Feature 213mm eye relief |
Feature 2Side pressure quick release plate |
Feature 3With a brass pressure ring |
Feature 3FMC optics |
Feature 3Detachable as a monopod |
MaterialPlastic & metal |
MaterialMetal |
MaterialCarbon Fiber Tube |
Specifications:
| Size: | 1.25-Inch |
| Coatings: | Dielectric |
| Reflectivity: | 99% |
| Thread: | 28.5*0.6 |
| Material: | Aluminum Alloy |
| Net Weight: | 125g / 4.41oz |
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Product information
| Product Dimensions | 4.4 x 3.3 x 2.4 inches |
|---|---|
| Item Weight | 7 ounces |
| ASIN | B08QRY4V97 |
| Item model number | FF9171B |
| Customer Reviews |
4.6 out of 5 stars |
| Best Sellers Rank | #7 in Telescope Diagonals |
| Date First Available | December 16, 2020 |
| Manufacturer | SVBONY |
| Country of Origin | China |







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