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Costa Del Mar Harpoon Polarized Sunglasses - Costa 400 Glass Lens
What is 400 glass mean I have seen like 500 somthing what is...
By Tom Ponder
Ranked #2128 - Sunglasses
February 24, 2009
What is 400 glass mean I have seen like 500 somthing what is that
View Details: Costa Del Mar Harpoon Polarized Sunglasses - Costa 400 Glass Lens
By Geoff Thomas
Ranked #558 - Sunglasses
February 24, 2009
The 400 glass is just your basic polarized glass lens that gives clearer vision than the their polycarbonate Cr-39 lens, but the cr-9 lens will weigh less so they will feel more comfortable when being worn for longer periods of time. The 580 glass blocks most of the yellow light spectrum which has a wave length of around 580 nanometers (hence the name 580 glass), this improves contrast and delivers deeper colors. The 580 glass uses a special filter which unfortunately makes them a lot more expensive.
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