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  1. B

    how much the laser power drops in 50m,100m,200m ?

    There is a constant ? depends on air quality? weather? humidity? Thanks for the attention.
  2. B

    OD 4+ Is too much for a 200-300 mw red?

    Hi to every one, I´m new in this forum and this is my first post, Just to u know, I live in Rio de Janeiro, Brazil, I already got some crapy lasers and after found this forum my interest in laser just grown a lot :P Before i get any Hi power laser i want to buy a good protection... My...


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