Antlia H-Alpha Edge Filter with 4.5 nm Band Width, 36 mm unmounted

Written by Aaron Urquhart
on 2025-07-22

"How I Use It I mount this on my 36?mm filter wheel when shooting H?II regions and planetary nebulae with a fast astrograph (f/2.8–f/4). It pairs well with color cameras, helping isolate the 656.3?nm emission and improve detail by suppressing broad-spectrum and moonlight glow. Recommended For Astrophotographers with monochrome or color OSC cameras who: •Use fast optics and want consistent performance across f/3+ systems •Want minimal processing overhead thanks to higher signal-to-noise (SNR) •Capture Ha-rich targets like the Horsehead, North America, or Veil nebulas •Work on galaxies with redshifted Ha and need a slightly wider bandpass Quality & Optical Performance •The EDGE series delivers over 90% peak transmission with OD5 blocking •Built on a single Schott optical substrate with 60/40 scratch-dig, <30? parallelism, and a tight wavefront spec •Blue-shift optimized to ±1?nm at f/3, so it’s fully compatible with fast systems like RASA and Hyperstar •Steep band edges reduce halos and increase contrast even with bright stars nearby User Feedback (Summarized) Long-term users report high contrast, minimal halos, and consistent performance even under moderate light pollution. Common sentiment is that it rivals 3?nm filters in contrast, with less risk of bandshift or signal loss on fast scopes. Final Verdict This Antlia H?Alpha 4.5?nm EDGE filter is a high-performance tool for serious astrophotographers, particularly those using fast optics or targeting Ha-rich nebulosity. The balance between maximal signal and minimal halos makes it a versatile, durable choice. Pricing around USD?225–320 depending on vendor. Excellent optical value. Highly recommended for anyone building a narrowband setup or optimizing signal and image contrast under light-polluted skies or fast focal ratios."