from the info posted at
http://www.elvex.com/Facts-What-chan...Z87.1-2010.htm
Quote:
High Mass Impact
Frame shall be capable of resisting impact from a pointed projectile weighing 500g (17.6 oz.) dropped from a height of 127 cm (50 in.).
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It says frame, not the lens itself according to the way it was written here.
If you want to take the other test:
Quote:
Drop-Ball Impact
Basic impact requirement for all devices: 1 inch diameter steel ball dropped at 127 cm (50 inches)
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An object dropped at sea level from 127 cm will be traveling at 5 m/s.
1 inch steel ball weighs .066953 kg
.8369 Joule
mass of steel I used for calculation was
http://steelmedia.com/steel-balls-data.htm
66.953 kg per 1000 balls. 1 ball is .066953kg per ball.
=0.5*(0.066953*(5*5)
.8369 J
Still not enough.