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Some of the replies are only guessing at the answer and the effects, IMO.
I live 50 metres from the salt water, with a house that faces the prevailing wind. All external fittings on my house have to be stainless steel, otherwise they disintegrate in a very short space of time.
I own two scopes and have done for several years. I keep both scopes in the garage and keep a cover over them when not in use. I don't have any "serious" problems with salt corrosion. As Nightstalker indicates, the most important thing is to clean your optics, particularly the primary mirror, on a regular basis. I clean mine twice a year. If I lived away from the coast the mirrors might get cleaned every second year.
Buy your scope with confidence and enjoy it.
Cheers,
John B
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