Dual-Band H-Alpha OIII Astrophotography Filter

Elevate your astrophotography with this 2-inch dual-band H-Alpha/OIII filter. Perfect for One-Shot Color cameras, it isolates the key emission lines while reducing bright star halos, making faint emission nebulae and planetary nebulae stand out with vivid detail.

Whether imaging from the backyard or darker skies, it enhances contrast and clarity for stunning deep-sky photography.

Key Features

• Dual 7nm H-Alpha/OIII Narrowband – Highlights emission nebulae and planetary nebulae

• Effective in Light-Polluted Conditions – Capture clear images in moonlit or urban skies

• Single-Shot Color Compatible – No need for multiple filter exposures

• High Transmission & Sharp Cut-Off – Maximises detail and colour fidelity

• Optimized for One-Shot Color Cameras – Works with DSLR, CMOS, and CCD sensors

• 44mm Clear Aperture with 2-Inch Thread – Fully threaded for secure mounting

• Enhances Deep-Sky Objects – Reveals faint structures with high contrast

Specifications

• Size: 2 inch (50.8mm)

• Substrate Thickness: 1.85mm

• Clear Aperture: 44mm

• Wavelength Range: 350–1100nm

• Blocking: >OD5

• Peak Transmittance: 500.7nm@T>85%, 656.3nm@T>83%

• Surface Quality: 60/40

• Surface Parallelism: 1/4λ

• Thread: M48x0.75 (Single Thread)

• Net Weight: 13g

Package Contents

• 1 x 2" 7nm H-Alpha/OIII Dual-Band Filter

• 1 x PP Plastic Box

What Makes This a Smart Buy:
This filter is ideal for astrophotographers looking to capture vivid, high-contrast nebula images in a single shot. Its precision design ensures maximum clarity and colour accuracy, even in challenging light conditions.