ToupTek PureSight A1 2" Dual Narrowband Filter (Ha + OIII)

Unlock deep-sky detail even under heavy light pollution.

🌌 Designed for Modern Astrophotography

Engineered for one-shot colour cameras, the PureSight A1 isolates the two most important nebula emission lines: Hydrogen-Alpha (656.3nm) and OIII (500.7nm). Perfect for imaging from suburban gardens or light-polluted skies.

🎯 Ultra-Narrow 5nm Precision

With a tight 5nm bandpass, this filter surgically removes unwanted wavelengths while preserving critical nebula signal.

• Pinpoint contrast on emission nebulae
• Massively reduced skyglow
• Enhanced colour separation in OSC cameras

🚫 Extreme Light Pollution Rejection

Featuring OD5+ blocking, the filter removes 99.999% of unwanted light — including streetlights, LED glow, and urban haze.

Result: darker backgrounds, higher contrast, cleaner data.

✨ Premium Optical Construction

Built using fused silica glass and advanced IAD coating technology for durability and performance.

• >90% transmission efficiency
• Low halo & ghosting suppression
• Sharp star profiles
• 60/40 surface quality

⚡ Optimised for Fast Optics

Designed for modern fast systems:

• Ideal from F/3.2
• Stable performance down to F/2.8

🔧 Built for Real Setups

Precision CNC aluminium housing with matte black finish reduces reflections and improves durability.

• Standard M48 x 0.75 thread
• Fits filter wheels & drawers
• Effective aperture: 43.9mm
• Frame height: 5mm

🔭 Compatibility

Works seamlessly with:

• Full-frame & APS-C cameras
• Filter wheels (5 & 7 position)
• 2" filter drawers

📊 Transmission Curve

🛠 Easy Installation

Thread side faces the sensor. Installs in seconds into any standard 2" system.

📦 What’s Included

• 1 × PureSight A1 Dual Narrowband Filter

📐 Key Specifications

• Bandpass: 5nm (Ha & OIII)
• Transmission: >90%
• Blocking: OD5+ (200–1100nm)
• Material: Fused silica
• Thickness: 2mm
• Parallelism: ≤30"
• Thread: M48 x 0.75

🚀 Why Choose This Filter?

If you image from the UK (or anywhere with light pollution), this is one of the most effective upgrades you can make.

• ✔ Shoot nebulae from your garden
• ✔ Dramatically improve contrast
• ✔ Perfect for OSC cameras
• ✔ Built for fast modern astrographs

Turn washed-out skies into deep space detail.