Baader Ultra Narrowband O-III CCD-Filter (4.5nm) (Specify Size)

• Premium grade O-III CCD-filter for fast optical systems f/8 to f/3
• IR-blocked
• NO halos, NO reflections, NO ghosting
• non-aging sealed coating edges

Baader's New Ultra Narrowband Enforced Filters

These three sizes of Ultra-Narrowband filters open up the extremely narrow H-alpha, O-III, and S-II world. This enforced contrast provides more signal of the faintest nebula detail. Manufacturing such ultra-narrow filters requires extreme coating homogeneity and very high Center Wavelength Precision, which these filters have been designed for. Designed for use on optical systems from f/10 to f/3.5.

Now available in all popular sizes; 1.25"Mounted, 2" Mounted, 31mm Round, 36mm Round, 50.4mm Round, 50x50 Square, and 65x65mm Square.

1.25"

2"

31mm

36mm

50.4mm

50x50mm

65x65mm