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To put it simply: 12nm Filters are the right choice for all DSLRs and dark-current limited cameras
5KHz / 70dBm@25KHz Audio Response +1~ -3dB Digital Protocol ETSI-TS102 361-1
blue and luminance
which can better reduce chromatic aberration
the FRA600 uses a Petzval-style 3+2 configuration: a front triplet (including two ED elements) manages aberrations
Askar PHQ65 APO Refractor (65 mm Quintuplet f/6.4) – Dark Clear Skies circle To put it simply: 12nmAskar PHQ65 Quintuplet Flat Field APO Refractor The Askar PHQ65 is a premium quintuplet APO refractor engineered for astrophotography. Its flat field optical design means no separate flattener is requiredmaking setup simple while delivering pinpoint stars across APS C and full frame sensors. Key features Aperture: 65 mm with a high quality APO quintuplet design. Flat field: Built in correctionno extra flattener needed. Focal length: 416 mm at f 6. 4,
US$ 49999.50
US$ 49999.50
