Mirrorless Cameras vs. dSLRs
Mirrorless cameras are picking up fans among knowledgeable photographers, and they may well be the wave of the future, but they still have limitations when compared to larger dSLR cameras.
Bokeh or Depth of Field
Have you ever taken a look at a beautiful portrait of a person where their eyes are in sharp focus, but the background’s blurred? That effect is called bokeh, and you’ll also hear people call it “depth of field”.
Advantages of Aperture Control
A camera with adjustable aperture lets you change the amount of light that reaches the sensor and with that, control bokeh.
The Problem with Smaller Sensors
Another big factor in the equation is your sensor size. A “micro four-thirds” sensor needs to be multiplied by two to equal the physical area of the size of the full-sized sensor. This also effectively multiplies your aperture changing an f2.8 lens to something closer to a f5.6, and drastically reducing bokeh.