Brand
Inexpensive optics with the figures printed
SVBONY appears on this site in the filter shelves, the eyepiece shelves, the guide scope shelf, the camera shelf and several adapter shelves — almost always at the inexpensive end of each.
More than the price would suggest. The UHC filter gives its passing wavelengths; the CLS filter publishes both what it passes and what it blocks, with percentages on each. On this site that is the difference between a filter that can be compared and one that can only be believed.
The mechanical parts are simpler than the optical ones. A projection adapter is a tube with two threads, and its listing says so. That is not a criticism — it is what the part is — but it means the shelf position is decided by the thread figures rather than by anything optical.
Read the published numbers, not the product name. Two SVBONY items in the same shelf can be a well-specified filter and a plain machined tube.
0.5x focal reducer · 1.25 in · sold under the name “Barlow”
A 0.5x focal reducer in an anodised aluminium 1.25 in barrel, sold under the name “Barlow lens” while its own description correctly calls it a reducer.
Best for: Widening the field on a long-focal-length telescope, or shortening exposures on a camera
≈ €13
4 mm focal length · 62° apparent field · 42 g
A 4 mm aspheric eyepiece with a 62-degree apparent field, fully coated, in a 51 mm aluminium barrel with an M28.5 × 0.6 filter thread.
Best for: Lunar and planetary detail on a telescope with a long focal length
≈ £18 / €20
60 mm aperture · helical focuser · male T-thread
A 60 mm guide scope with a non-rotating helical focuser and a male T-thread at the eyepiece collar for screwing a guide camera on directly.
Best for: A guide scope that will spend half its life as a finder
≈ $82 / £94 / €100
8 MP · IMX415 colour sensor · 1.25 in barrel · USB 3.0
An electronic eyepiece with an IMX415 colour sensor that replaces a 1.25 in eyepiece and streams live video to a computer over USB 3.0.
Best for: Lunar and planetary video through a 1.25 in focuser, on a Windows or Linux laptop
≈ £84 / €100
20–60x zoom · 80 mm objective · UNC 1/4-20 tripod thread
A 20–60x80 angled spotting scope with BAK4 prisms, a 21 mm eyepiece for long eye relief, a second-generation desk tripod and a universal phone adapter.
Best for: Birdwatching and casual sky watching where the eyepiece angle matters
≈ £100 / €105
UHC · 1.25 in · double-sided multi-layer coating · no passband published
A 1.25 in UHC filter with a precision-polished substrate and double-sided multi-layer coating, sold for raising nebula contrast — with no wavelengths published.
Best for: A first nebula filter for a suburban sky, bought on price rather than on specification
≈ $28 / £24 / €31
A fully multi-coated 0.5x reducer for 1.25 in fittings, supplied with a C-mount adapter for cameras that use that thread.
Best for: A small sensor camera with a C-mount thread on a long-focal-length telescope
A 1.25 in projection adapter with an extended 68 mm barrel carrying M42 × 0.75 threads on both the inside and the outside, fully threaded internally against reflections.
Best for: Eyepiece projection on a telescope with generous focuser travel
A CLS broadband filter publishing 90 per cent transmission at the hydrogen, oxygen and sulphur lines and 0.1 per cent at the sodium and mercury lines of artificial lighting.
Best for: Imaging or observing emission nebulae from a town, with a colour camera or by eye
A metal collimator supplied with a 2 in adapter so it fits both focuser sizes, with a triplet lens and seven brightness settings.
Best for: An observer with both a 1.25 in and a 2 in focuser who wants one collimator for both
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
