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I don't think that necessarily implies that the inside will get dusty. For example, if the air intake had a HEPA filter with a sufficient lifetime, only particl
by ijpoijpoihpiuoh 7y ago
I don't think that necessarily implies that the inside will get dusty. For example, if the air intake had a HEPA filter with a sufficient lifetime, only particles smaller than the filter's rating would be able to enter the body of the lens.
- lmilcin 7y agoI suspect this is design tradeoff. First, hepa filters tend to block flow of air A LOT. Lens designers strive to get lenses to focus as quickly as possible. Any blockage of air would necessarily make it very difficult for the lens to breathe quickly. Second, dust particles in the lens do not affect the image nearly as much as you would think they do. Just look at this pic: https://www.lensrentals.com/blog/2008/10/front-element-scratches/ https://www.lensrentals.com/blog/2008/10/front-element-scrat...