Alot of sharpness issues come from failed focusing or a lack of understanding when it comes to focusing correctly. Modern cameras generally have impressive autofocus capabilities – but for absolute precision, you should master manual focusing.
“I greatly prefer manual focus for landscapes,” says Matt Reynolds. “I think many new users are afraid of manual focus and hesitant to use it, but at closed-down apertures it is actually not complicated and, after some experience, can even be faster.”
“Mirrorless cameras have some built-in focus aids to help with manual focus, such as focus peaking and focus magnification. For me, the most used and helpful is focus magnification, where I can zoom into the scene and check focus at my current aperture settings with an assigned button.”
Similarly, on a DSLR…