The D300 body is pretty well sealed. I have had mine very dusty and quite wet with no ill effects (that I have yet noticed).
The weak point is typically the lens mount. The 70-200 is a top flight lens so includes the proper rubber seal around the mount. Many lenses do not include that seal and subsequently that becomes the weak point.
I would be happy to test your 70-200 for you if you are unsure![]()




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