Achromatic Cemented Convex Lens Diameter 74mm Focal Length 3000mm H-K9L/F4 Homemade Astronomical Telescope

Achromatic Cemented Convex Lens Diameter 74mm Focal Length 3000mm H-K9L/F4 Homemade Astronomical Telescope
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sku: 1005003970407240
$42.98
Shipping from: China
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