S-series UV IR-CUT 1.25" Filter

Product Overview

The Player One Astronomy S-series UV IR-CUT 1.25″ filter keeps your camera inside the visible band, passing more than 95% of visible light while blocking the ultraviolet and infrared that would otherwise bloat stars and soften planetary and lunar detail. It is a straightforward, high-transmission way to tighten focus and hold true colour in your imaging train.

Who It's For

This filter suits imagers using refractors and other optics that are not corrected across UV and IR, where that stray light spreads the focus. If you shoot the planets, the Moon, or luminance frames with a colour or mono camera and want crisper, true-colour results, it belongs in your kit.

Key Features & Design

• UV and IR rejection: confines light to the visible band so stars focus tightly and planetary contrast improves.
• High visible transmission: ≥95% throughput keeps images bright and colour true.
• Multi-layer composite coating: applied to a high-quality optical-glass substrate.
• 1.25″ format: threads into standard 1.25-inch cells, drawers, and filter wheels.
• Simple, passive optic: no power or electronics — just thread it in and refocus.

Optical/Mechanical Design

As a UV IR-CUT filter, it passes the visible band at high efficiency (≥95% transmittance) while attenuating out-of-band ultraviolet and infrared to optical density 2 (OD2). Removing those wavelengths matters because most refractors do not bring UV and IR to the same focus as visible light, so leaving them in enlarges star images and lowers planetary contrast; cutting them tightens focus and cleans up colour. The 2 mm-thick optical-glass substrate carries a multi-layer composite coating. Mechanically it is a 1.25-inch threaded filter with a 5 mm body plus 2 mm thread section (7 mm total).

Recommended Uses

• Planetary and lunar imaging with colour or monochrome cameras on refractors.
• Luminance capture where UV/IR bloat would otherwise soften stars.
• Everyday visible-band imaging that benefits from tighter focus and true colour.

Compatibility & Accessory Notes

• Fit: standard 1.25″ filter thread — works in 1.25-inch cells, drawers, and filter wheels.
• Cameras: pairs with one-shot-colour and monochrome astronomy cameras.
• Backfocus: the 7 mm cell and 2 mm glass add to your optical path; include them in your spacing calculation.

Good to Know Before You Order

• This is an imaging filter that improves sharpness and colour by removing UV and IR; it is not a light-pollution or narrowband filter.
• Out-of-band blocking is specified at OD2, which suits general visible-band imaging; for demanding refractor work at the highest contrast, a deeper-blocking filter may be preferred.
• Player One does not publish a net weight for this filter, so the shipping weight shown at checkout is an estimate. Contact us if you need an exact figure.

FAQ

Is it difficult to set up? No. It threads into a standard 1.25-inch cell, drawer, or wheel and needs no power or configuration; refocus once after fitting.

What does a UV IR-CUT filter do? It limits the light reaching your sensor to the visible band, cutting the ultraviolet and infrared that most refractors do not focus to the same point, which sharpens stars and improves planetary and lunar contrast.

Will it change my colour balance? It preserves true visible colour by removing only the UV and IR wings; more than 95% of visible light passes through.

Can I use it visually? Its main purpose is imaging, where the focus and colour benefits are most visible, though it fits any standard 1.25-inch filter thread.

Bottom Line

The S-series UV IR-CUT 1.25″ filter is an affordable, high-transmission way to keep imaging in the visible band, giving you tighter stars and truer colour on planetary, lunar, and luminance work.