The reason is one of physics and optical design. Lenses
are made so they can focus on far objects, as long as
they are the proper distance from your camera’s image
sensor. Mirrorless cameras have a very short space
between the lens mount and sensor, making it simple to
engineer adapters to support lenses from other systems;
the most basic adapters are light-proof tubes with the
proper mounts on both sides.
So with a mirrorless model, you can move beyond
lenses that are purpose-built for your camera. There are
¿UVWSDUW\RSWLRQVPRVWZLWKVRPHGHJUHHRIDXWRIRFXV
support, as well as a number of third-party choices.
Today’s mirrorless cameras include models with sensor
sizes and prices running the gamut. Electronic
YLHZ¿QGHUWHFKQRORJ\LVPDWXUHWRWKHSRLQWZKHUH
you’ll have an easier time focusing manually using an
EVF than an old-school SLR pentaprism. Digital tools,
LQFOXGLQJSHDNLQJKLJKOLJKWVDQGIUDPHPDJQL¿FDWLRQ
eliminate guesswork.
Mirrorless
cameras have a
short space
between the
lens mount and
sensor, making
it simple to
engineer
adapters.