Antlia 3nm Narrowband SII Pro Highspeed Filter - f/2.6 to f/3.6

Introducing the Antlia 3nm OIII Pro Highspeed Filter, specifically engineered for ultra-fast optical systems. This enhanced version is pre-shifted to compensate for the natural blue shift that occurs in fast focal ratio telescopes. By offsetting the central wavelength toward the red end of the spectrum, the filter maintains optimal signal capture in systems operating between f/2.6 and f/3.6, delivering significantly improved signal-to-noise ratio compared to standard 3nm filters.

In high-speed imaging systems, the converging light cone increases the angle of incidence (AOI), causing interference filters to shift toward shorter wavelengths. At f/2.6, this shift can reach up to 2.2nm. The Antlia 3nm Pro Highspeed filter is precisely pre-shifted to counteract this effect, ensuring maximum transmission at the critical 500.7nm oxygen-III emission line during real-world use. With peak transmission exceeding 90% and a true 3nm bandwidth, this filter maximizes contrast while preserving delicate nebular structures.

Features

• Pre-Shifted Spectral Design: Compensates for blue shift in fast systems, maintaining optimal signal accuracy.
• High-Speed Optimization: Designed specifically for focal ratios between f/2.6 and f/3.6 with minimal signal loss.
• Improved Sharp Cut-Off: Advanced coating design minimizes halos around bright stars while maintaining high contrast.
• Exceptional Blocking: OD5 (0.001%) out-of-band blocking across 300–1000nm ensures excellent signal-to-noise ratio.
• Single Substrate Construction: Non-glued optical substrate eliminates internal reflections for cleaner images.
• Versatile Application: Ideal for imaging planetary nebulae, supernova remnants, and emission nebulae rich in OIII signal in both light-polluted and dark-sky locations. Extends productive imaging time even under moonlit conditions.
• Edge Blackening: All unmounted Highspeed filters feature blackened edges to suppress stray light reflections.
• Optical Precision: Manufactured with strict quality standards to reduce post-processing and enhance reliability.

Please note that the Antlia 3nm OIII Pro Highspeed filter is specifically optimized for fast focal ratio systems. While it can function in slower systems, it is purpose-built to deliver maximum performance in high-speed optical configurations.

For astrophotographers using RASA, Hyperstar, and other fast imaging platforms, the Antlia 3nm OIII Pro Highspeed Filter provides the precision engineering required to fully exploit the capabilities of modern ultra-fast telescopes.

This filter is not suitable for solar observation or imaging. OIII filters designed for deep sky applications are not engineered to handle the intense light from the sun. Attempting to use this filter for observing or imaging the sun can result in severe damage to your equipment and pose serious risk of eye injury or blindness. Always ensure that you are using the correct type of filter for solar observation to protect both yourself and your equipment.