оборудование

Svbony provided me with a Svbony SV503 70F6 ED telescope for review. This is a small 70 mm refractor with a two-lens cell, and one of the lenses is made of S-FPL51 glass. The use of ED glass provides a significant reduction in color halo (longitudinal chromatic aberration) around bright objects compared to a classic achromatic refractor of the same focal length. I also received a native Svbony SV193 0.8x (0.8x for 70F6ED) field flattener for this refractor for review.

Svbony SV503 70F6 ED

Svbony SV503 70F6 ED

Svbony SV503 70F6 ED can also be used as a spotting scope. And if the 80 mm ED version of the telescope is too large for such purposes, then the 70 mm version is already quite compact and mobile. Of course, a dedicated spotting scope will be even lighter and more compact, but if you need a versatile device for astronomical and terrestrial observations, then the SV5o3 70 ED will be a good choice.

The manufacturer has declared the following characteristics:

Product Name SVBONY SV503 70F6 ED Astronomy Telescope
Type Refractor
ED Glass S-FPL51
Coating SMC
Aperture 70mm / 2.75-Inch
Focal length 420mm
Focal Ratio f/6
Type of Focuser RAP (Rack and Pinion)
Gear Reduction 1:10 Fine movement
Resolving capacity 1.97″
Limit value 11.3
Light gathering capacity 100x
Max. Useful magnification 140x
Tube weight 2.22kg
Tube outer diameter 88mm
Tube material Aluminium
Back Focus Length 90mm
OTA Length 318mm
Dovetail & Ring Yes
Dovetail Length 150mm

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Svbony provided Svbony SV503 80ED F7 Doublet Refractor for my review. This is a small 80mm refractor with a doublet lens, one of which is made of S-FPL51 glass. The use of ED glass provides a significant reduction in color halo (longitudinal chromatic aberration) around bright objects compared to a classic achromatic refractor with the same focal length. Also for review, I received a native Svbony SV193 0.8x field-flattener reducer for this specific refractor.

Declared specifications:

Model SV503
Aperture of objective lens 80mm
Focal length 560 mm
Focal ratio F7
ED Glass S-FPL51
Lens Coated Ultra-wideband coating(SMC)
Objective Lens type Double separation lens structure
Limit magnitude 11.6
Light-gathering Power 130.6x
Resolution 1.5 Arcseconds
Tube Material Aluminum
Focuser 2 inch Dual speed focuser
Reduction ratio 1:10

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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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