The Dark Clear Skies 2″ UV/IR Cut Filter is designed to block unwanted ultraviolet and infrared wavelengths while maintaining high transmission across the visible spectrum. It is intended for astrophotography and imaging applications where accurate colour balance and sharp focus are required.

Purpose & Use
Many modern astronomy cameras and optical systems are sensitive to ultraviolet and infrared light, which can cause bloated stars, reduced sharpness, and colour imbalance. A UV/IR cut filter helps limit the incoming light to the visible range, improving overall image quality.
This filter is suitable for use with one-shot colour cameras, monochrome cameras without integrated UV/IR blocking, and optical systems not specifically corrected for infrared wavelengths.
Key Features
- Blocks ultraviolet and infrared wavelengths outside the visible spectrum
- High transmission in the visible light range
- Standard 2″ mounted filter format
- Compatible with filter wheels, drawers, and 2″ filter threads
- Suitable for astrophotography and EAA applications
Compatibility
Designed to fit standard 2″ (M48) filter threads commonly used in astronomy accessories, including filter wheels, filter drawers, and imaging adapters.
Typical Applications
- Deep-sky astrophotography
- Planetary and lunar imaging
- EAA (Electronically Assisted Astronomy)
- Imaging with cameras lacking built-in UV/IR filters
Technical Specifications
| Filter Type | UV / IR Cut (Visible Light Pass) |
| Clear Aperture | Approx. 45 mm |
| Filter Size | 2″ (M48 × 0.75 thread) |
| Optical Thickness | Approx. 2.0 mm |
| Substrate | Optical-grade glass |
| Coatings | Multi-layer anti-reflection coatings |
| Transmission (Visible) | >90% across the visible spectrum |
| UV Cut-Off | Below approx. 400 nm |
| IR Cut-Off | Above approx. 700 nm |
| Filter Cell | Anodised aluminium |
| Application | Astrophotography, EAA, lunar & planetary imaging |
If you are unsure whether a UV/IR cut filter is required for your setup, feel free to contact us for advice before purchase.