Explore Scientific AR102 4 f/6.5 achromatic doublet refractor optical tube

This highly portable 4 Explore Scientific achromatic refractor optical tube (only 25.5 long, with a weight of 11.3 pounds) is a great value for

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Explore Scientific AR102 4 f/6.5 achromatic doublet refractor optical tube

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Explore Scientific AR102 Air-Spaced Doublet Refractor

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