Need some critique on camera

i need some critique on camera setting.
is

focal length = 275 mm
camera(size) = 40 mm

is this correct?

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There is no right or wrong answers here.

Wide lens (small mm) encompasses more field of vision on to the same canvas. You get to see more stuff but they are smaller on the canvas.

Tele lens (large mm) has a narrow field of vision, which enlarges a very narrow portion of what you can see with your eye into the entire canvas. Telephoto compresses perspective so everything looks like its on the same plane.

https://docs.blender.org/manual/en/latest/render/cameras.html

There is some ramification on the camera size under specific circumstance but most of the time I leave it unchanged.

OK thanks…