Making A Refractor Telescope Norman Remer Pdf 12 New 💯 Essential

Variant 8 — Travel Maksutov-Refractor Hybrid

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: A rear, concavo-convex or double-concave lens made of high-dispersion glass (typically Flint SF1) that corrects the color dispersion introduced by the crown lens. Variant 8 — Travel Maksutov-Refractor Hybrid I cannot