TS Optics 2″ Premium UHC filter
Do you live in or near a city, and does light pollution spoil your enjoyment of the night sky? The TS Optics 2″ Premium UHC filter is exactly what you are looking for. This filter effectively suppresses the disruptive glow of street lights, advertising signs and illuminated buildings, allowing you to enjoy deep sky objects without having to make a long journey to a dark site. Hundreds of new objects will suddenly come within reach of your telescope, and those you have already observed will reveal new details and significantly higher contrast.
How the UHC filter works
The UHC filter for light pollution reduction works on the principle of narrow-band light transmission. While it blocks most wavelengths typical of artificial lighting - sodium and mercury vapour lamps, LEDs - it transmits only those wavelengths that are characteristic of astronomical objects: specifically the oxygen O-III band (around 496 and 501 nm) and the hydrogen H-beta line (486 nm). The result is a dramatic increase in contrast between the sky background and the observed object, while the brightness of the object itself is preserved.
Ideal objects for observation
The filter is particularly well suited for observing emission and planetary nebulae, which radiate precisely in the O-III and H-beta bands. Typical examples include:
- Orion Nebula (M42)
- Ring Nebula (M57)
- Dumbbell Nebula (M27)
- Veil Nebula in Cygnus
Compatibility and recommended use
The filter is designed for accessories with a 2″ diameter and is compatible with all standard eyepiece holders of this format. Using a 2″ to 1.25″ reduction adapter, it can also be used with smaller eyepieces. The manufacturer recommends use with telescopes having an objective diameter of at least 70 mm - the larger the aperture, the better the filter will demonstrate its capabilities.
Build quality and optical coatings
The filter features a precision-cut thread and a carefully machined aluminium body, ensuring accurate and play-free seating in the eyepiece thread. The optical glass is anti-reflection coated on both sides to prevent unwanted reflections or stray light that would otherwise degrade the final image.
| Parameter |
Value |
| Filter size |
2″ |
| Transmitted bands |
O-III (496 nm, 501 nm), H-beta (486 nm) |
| Filter type |
Narrow-band UHC (Ultra High Contrast) |
| Body material |
Aluminium |
| Optical coating |
Anti-reflection coating on both sides |
| Minimum recommended aperture |
70 mm |
| Adapter compatibility |
2″ to 1.25″ with reduction adapter |
About TS Optics
TS Optics (Teleskop Service) is a German brand with a long tradition in astronomical optics, widely popular among both beginners and experienced observers. TS Optics Premium UHC filters are repeatedly praised for their excellent price-to-performance ratio - offering characteristics comparable to significantly more expensive competing products. Strict outgoing quality control and careful selection of optical glass ensure that every unit meets the high demands of serious astronomers. If you are looking for a reliable filter that will genuinely make a difference at your next observing session, the TS Optics 2″ Premium UHC filter is the right choice.
