Sony a6400
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Sony a6400

From the outside, it's only really the switch around the AEL button that distinguishes the a6400 from its more basic sibling

The next model up from the a6100 is the a6400. You get a higher-res viewfinder, giving 1024 x 768 pixels from its 2.36m dots. You also get 'moisture and dust resistant' magnesium alloy construction (though, as is all too common, this resistance comes with no guarantee or substantive claims of effectiveness).

The a6400 offers a customizable AF/MF switch on the back of the body, which the a6100 lacks, but that's about the extent of the physical handling differences. On the software side you gain a handful of menu options, including the ability to set the Auto ISO shutter threshold, define different AF areas and area modes by camera orientation and set up custom features such as 'My Dial.' These all make a difference if you like to define the fine detail of the camera's handling.