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Message: <blockquote data-quote="spb_stan" data-source="post: 682884" data-attributes="member: 43545">Air shows and beach require wide DR and high maximum shutter speed. So the fastest shutter is 1/4000. Since you are starting fresh, and need lenses you are a good candidate for the Z6 which is faster i frame rate and 2 generations more advanced image processor and other advantages not the least of which is the new Z mount that has a lot of advantages. Since you listed beach(with its water droplets in clear air, sand,  dust a sealed camera would stand a lot better chance of survival. The D750 is a good image marker but it is not a rugged body with weather sealing. Aircraft, except in low passes, are really not hard to track, much easier to predict where it will be in 1/2 second than a bird. Birds are the ultimate test of tracking since they are small, often not contrasting much from the sky, and speed across an arc can be a lot faster than aircraft which have much higher absolute speed but as a greater distance so the speed with which a plane covers a few degrees of an arc is slower. A small bird 50 feet an away moves through the same degrees of an arc than a fighter jet at 300 yards. That means you have a wider range of telephoto lenses to consider, including some that are not known for focusing speed. For aircraft either a Z6 or D500, and for the beach, the Z6 would be more sand, moisture and grit resistant.For subject requiring specialized lenses like the reach for aircraft, deciding on the lens first helps with the choice of cameras.  How large and how much bulk would you be content to tolerate and how far are you from the aircraft?</blockquote>

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