QBP (Quad Band Pass) is a relatively wider narrowband filter, which specifically passes SII, Ha, OIII and Hb.
- Glass thickness : 1.5mm
- Glass type : Fused Quartz – excellent purity and transmission including UV. Extremely low contamination. High heat resistance.
- M48 (for 2″) and M28.57mm/0.53mm pitch (for 1.25″) mounted
- Made in Japan