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ACHROMATIC OBJECTIVE LENS SET 71.9MM DIA X 700MM FL CTD

$19.50 USD
Product Code: L14954
Availability: Out Of Stock


 Crown and flint when put together produces a coated achromatic objective lens 71.9mm diameter with a focal length of 700mm  Great for making an inexpensive but quality scope.  Place the crown (double convex) with its strongest curve against the negative side of the flint.  Use a couple pieces of masking tape on the edges to hold them together.  The crown side faces the sky or the object you plan to look at.  Unused.

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