Eclipse viewing made simple
Excitement is building for the total eclipse of April 8, 2024. Viewing such solar eclipses must be done cautiously.
Source: astronomy.com
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You Can 3D Print and Build This 164mm f/2.5 Lens for Less Than $15
This design for a 3D-printed 164mm f/2.5 lens has no screws, uses affordable glass elements, and can be built at home for less than $15.
Source: petapixel.com