BAADER CMOS O-III 4nm F/3 ULTRA-HIGHSPEED FILTER primary mirror Backfocus distance 55 mm +
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BAADER CMOS O-III 4nm F/3 ULTRA-HIGHSPEED FILTER primary mirror Backfocus distance 55 mm +The new Baader CMOS optimized O III 4nm Highspeed F 3 filter is a precision grade narrowband filter with a high transmission at the Oxygen III line at 500. 7nm. The Highspeed F 3 versions are specifically designed to work very well with modern highly sensitive astronomy cameras and telescopes with extremely fast focal ratios between f 3. 4 and f 2. 3 such as the Sharpstar Hyperbolic Newtonian astrographs. The ultra narrow 3. 5nm bandpass makes this
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