ASKAR FRA400 F/5.6 APO REFRACTOR Nadirus 16" It has a thickness of

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ASKAR FRA400 F/5.6 APO REFRACTOR Nadirus 16" It has a thickness ofThe Askar FRA 400 f 5. 6 is a professional apochromatic Petzval quintuplet with an aperture of 72mm and a corrected field of 44mm in diameter. The lenses are assembled in two groups: an air spaced triplet on the front and a correcting doublet towards the focus. The objective lens includes two Extra Low Dispersion glass for a superb chromatic correction. Differently from standard ED refractors, the Askar 400 features a Petzval design that does not

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