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the FRA600 uses a Petzval-style 3+2 configuration: a front triplet (including two ED elements) manages aberrations
blue and luminance
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which can better reduce chromatic aberration
Askar PHQ65 APO Refractor (65 mm Quintuplet f/6.4) – Dark Clear Skies circle the FRA600 uses a Petzval-styleAskar 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,
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