Uncategorized · Astrophoto Filter

Antlia Sulfur II (SII) 3nm Pro Highspeed 1.25" Filter (ANT-SII-3NM-PRO-125-HS)

Antlia · sold by All-Star Telescope Canada · CAD 380.56 · in stock

Antlia's SHO 3nm Pro Highspeed Filters are further optimized for high-speed imaging systems by pre-shifting the center wavelength. This specially-optimized version will provide significantly SNR (Signal to Noise Ratio) for the fast telescopes with focal ratio between f/2.6 and f/3.6 than the standard 3nm Pro version. The optical light path of a telescope is cone-shaped, which creates an angle, and the center wavelength of the interference filter will shift toward shorter (blue) wavelengths as the angle of incidence (AOI) increases; the greater the angle, the greater the shift. The amount of…

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