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Svbony company has kindly provided me with several eyepieces for testing. One of them – SV190 18mm 1.25″ Ultra Flat Field Eyepiece FMC. A flat field (no curvature), a large eye relief (20 mm) and a field of view of 65 degrees are declared. Interesting!

The focal length of 18 mm is one of my favorites, as it is especially in demand with “fast” telescopes (f\5…f\6) when observing deep space objects (galaxies, nebulae, clusters). With “slow” telescopes (f\8…f\12), the eyepiece can be used for observing the Moon and bright compact objects in deep space.

Svbony SV190 18mm 1.25

Svbony SV190 18mm 1.25″ Ultra Flat Field Eyepiece FMC

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I received an SVBONY SV171 Zoom Eyepiece 8mm-24mm (SKU: W9131A). for testing. The zoom eyepiece is very convenient for quickly selecting the optimal magnification, or for cases when you need to quickly change the magnification without having to change eyepieces. The focal length in the zoom eyepiece is changed by rotating the body. Along with the focal length, the angular field of view of the eyepiece also changes.

Declared characteristics:

Focal Length  8-24 mm
Eye Relief 18-19.5 mm
Apparent Field of View 38°-56°
Barrel Size 1.25″
Lens Structure  7-Elements/4-Groups
Filter Threads Standard 1.25″(M28.5 x 0.6)
Coatings Fully Multi-Coated
Blackened Lens Edges Yes
Barrel Safety Recess Yes
Eyecups Twist-Up, metal

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SVBONY SV152 20mm SWA Illuminated eyepiece

SVBONY SV152 20mm SWA Illuminated eyepiece

I received an SV152 20mm 70 Degree SWA Illuminated Eyepiece (SKU: W9115A) for testing.
The manufacturer positions this eyepiece for the following applications:
-setting the exact alignment of the telescope and finder
-polar alignment (by drift method)
an invaluable aid to centering guide stars and astrophotography target objects
-the perfect eyepiece for alignment of computerized GoTo systems

Declared characteristics:
Field of view 70 degrees
Focal length 20 mm
Eye relief 16 мм
Crosshair – laser engraved
Lens group – 4 Group / 5PCS
Power – 2PCS 1.5V (AG5)
Lens Coated – FMC .
Field Stop – 25 mm
Thread – M28.5*0.6
Net Weight – 221g/ 7.8oz
Dimension – 75*53*102 mm

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