Alpine Astronomical Baader H-alpha Narrowband Filter (65mm Square)

This 65mm square Baader H-alpha narrowband filter is designed for optical systems with f/10 to f/3.5 ratios. It has a 6.5nm FWHM and is suitable for both modern CMOS sensors and older CCD camera technologies. The filter includes a Reflex-Blocker hard coating, plane optically polished surface, and Life-Coat sealed edges. It features blackened edges with a filter-lead side-indicator in the form of a black frontside outer rim to prevent edge reflections. Each filter is individually coated with sealed coating edges, ensuring non-aging coatings even in harsh environments.

• Material of Construction: Glass
• Dimensions: 2.6 x 2.6" / 65 x 65 mm (Square, Unmounted) 0.1" / 3 mm (Thickness)
• Package Weight: 0.2 lb
• Box Dimensions (LxWxH): 3.35 x 3.05 x 1"