SVBONY 1.25-inch 90 Degree Mirror Diagonal Brass Compression Rings for Refractor Telescope SV221
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Specifications
- Brand Name
- svbony
- Type
- Monocular
- High-concerned chemical
- None
- Model Number
- SV221
- Origin
- Mainland China
- Brand
- SVBONY
- Model
- SV221
- Size
- 1.25inch
- Optical Design
- Mirror Diagonal
- Inner Connection (Lens Sided)
- Thread M28.5x0.6
- Outer Connection (Lens Sided)
- 6.Barrel 1.25inch
- Inner Connection (Eyepiece Sided)
- 7.Clamp 1.25inch
- Reflection Surface
- Aluminum Coated
- Reflectivity
- >92%
- Image Orientation
- Erect Image, Mirror Inverted
- Optical Length
- appr. 73mm
- Clamping System
- Screw clamps
- Deflection Angle
- 90°
- Clear Aperture
- 29.5mm
- Material
- 15.Plastic & metal
- Net Weight
- 90.5g/3.19oz
Product Description
SVBONY SV221 1.25-inch 90 Degree Mirror Diagonal Brass Compression Rings for Refractor Telescope
Enhanced Al Uminum Die
Higher light transmittance,clearer vision.
1.25" Diameter
which can be applied to a 1.25 inches telescope and a 1.25 inches eyepiece.
Brass Lock Screw and Compression Rings
Equipped with brass lock screw and compression rings for precise connection and protection against scratches and damages.
Internal Extinction Design
With internal extinction treatment and the acquired image is clearer and brighter
Screw Clamping System
Features a screw clamping system for secure and easy usage.
Supports 1.25-inch Filters
Features internal extinction treatment and supports the connection of 1.25-inch filters, offering versatility for various observations.
90 Degrees Design
You don't have to bend over when performing visual observation,and the observation experience is more comfortable
Specifications:
1.Brand: SVBONY
2.Model: SV221
3.Size: 1.25inch
4.Optical Design: Mirror Diagonal
5.Inner Connection (Lens Sided): Thread M28.5x0.6
6.Outer Connection (Lens Sided): Barrel 1.25inch
7.Inner Connection (Eyepiece Sided): Clamp 1.25inch
8.Reflection Surface: Aluminum Coated
9.Reflectivity: >92%
10.Image Orientation: Erect Image, Mirror Inverted
11.Optical Length: appr. 73mm
12.Clamping System: Screw clamps
13.Deflection Angle: 90°
14.Clear Aperture：29.5mm
15.Material: Plastic & metal
16.Net Weight: 90.5g/3.19oz
Package Includes:
SV221 1.25" 90 Degree Mirror Diagonal
3PCS M3 Screws
1PCS Dust Cap
1PCS Dust Plug
Pros & Cons
Pros
- Brass compression rings prevent marring eyepieces.
- >92% aluminum coated mirror for high light transmittance.
- Erect image orientation ideal for terrestrial viewing.
- Compact 73mm length, lightweight 90.5g.
Cons
- Plastic/metal build less premium than full brass.
- 27mm effective aperture limits wide-field views.
- 90° angle only, no variable options.
- Screw clamp may loosen over time.
Common Questions
What materials in SVBONY SV221 1.25-inch mirror diagonal?
Plastic and metal body with brass compression rings and aluminum coated reflection surface >92% reflectivity.
What size and optical specs for SVBONY 90 degree diagonal?
1.25-inch barrel, 29.5mm clear aperture, 73mm optical length, 90° deflection for refractor telescopes.
Is SV221 compatible with 1.25-inch eyepieces and telescopes?
Yes, fits 1.25" eyepieces via clamp and 1.25" telescope via M28.5 thread or barrel.
How to use SVBONY mirror diagonal for erect image viewing?
Provides erect non-inverted image; screw clamps secure eyepiece, enhances light transmittance for clearer vision.
Packaging and shipping for SVBONY SV221 telescope accessory?
Net weight 90.5g; package yes, ships from Mainland China.
Product information last updated on December 21, 2025