Yes there is sand, lost an objective lens in the gulf a few years back. Costly repair.... That said, New coatings? I don't trust them yet.... Oil in coal burning areas? Yes, add outdoor barbecue areas, inside industrial sites, boats (diesel), chainsaw competitions, model airplanes, etc. If you "get into" your photo taking, it's going to happen, pro or not... Pesticides in botanical gardens, yup. Coatings and human components need protection. Both don't like some of them. Many gardens use "misters" with reclaimed/ iron rich water. Eats coatings. Been there... Biota are the worst (bacteria, mold, fungus, airborn diatoms chitins at the shore or boat splash in salt water) DEADLY to lenses, regardless of coatings. And Saltwater spray (within 2 miles of shores)? Absolutely. Cameras don't like these anyway....
UV filters needed for UV control, nah. Usually use CPLs regularly. When no CPL or ND in use? High grade UV, B+W Nano, Bresson, Hoya HD or EVO, NISI LR... They even help an old "F" or "FA" lens with flare....
And when I sell/trade a lens? I get a better price since I watch the details. Makes "keeping the kit fresh" a heck of a lot cheaper...
---------- Post added 09-23-14 at 11:00 AM ----------
Originally posted by promacjoe ...But it only takes a 15 mile an hour wind to pick up enough sand and grit to start etching the coating on your lens.
As I said, I don't recommend leaving them on all the time, but I do recommend having them available.
And it is your choice whether to use them or even have them in your bag.
WELL SAID.... I burn "filters" and high graded "NANO" coated ones 1-3 per year.... Just look at them in fluorescent light. Lots of dings, chem stains, Biota issues... Much better/ cheaper than burning an objective.....
On your 15 MPH, I agree on non-nano/ SMC, and I hear that NANO are more resistant to it. Not buying it yet... Windshields are toast at 25mph, ask the insurance companies in winter "sanding/ rocksalt" states. BTW rocksalt is very abrasive since it's not pure...