imagemeister wrote:
IMO, the 18-400, being a lower resolving lens, the limiting factor for you is mostly the lens. Going from 16 to 24MP may only reveal the limits of the lens and not realize what you are looking for - just my educated opinion.
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I’ve gotten pretty good results from the 18-400. I found if you can stop down a little it helps a lot. I must admit that I have been pleasantly surprised by the good results I shoot with a Nikon D500.