Well finished, very good focus.
Unlikely its most common usage, I successfully used it for powering a small solar putt-putt boat.

Really recommend this lens.

I have been doing some optics experiments with head mounted displays, and these lenses have been my go-to lenses for testing. The grooves are unnoticeable at close range.

Fast delivery. Trust worthy seller. Product is of Good quality.Satisfied on over all. Thanks!

Good product for its price

good product, good packaging, fast shipping, thanks you