ZWO produces a range of quadruplet aprochromatic (APO) refractors from 65mm aperture to 130mm aperture with focal ratios of f/6.4 to f/7.7
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Showing all 3 results
ZWO produces a range of quadruplet aprochromatic (APO) refractors from 65mm aperture to 130mm aperture with focal ratios of f/6.4 to f/7.7