Hi David,
Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Production Gear › What lens does this? › Hi David,

Hi David,
Depth-of-field can be controlled with aperture, focal length and sensor size. Today, most shooters control it with sensor size. In general, the larger the sensor, the shallower the depth-of-field.
Here is a chart of relative sensor sizes (your camcorder's sensor is probably 2/3" or smaller):
APS-C camcorders such as the Sony NEX-VG30 and NEX-EA50 combine large sensors with standard camcorder ergonomics.
Generally, however, shooters who want shallow depth of field buy video capable, large sensor DSLRs, such as the Full Frame Canon 5D Mark III, APS-C Canon 70D or mirrorless DSLMs, such as the Micro 4/3 Panasonic GH3.
If you want shallow depth of field, and don't want to spend a lot of money, you can get an APS-C sensor Canon EOS M with the 22mm f2 lens for $342.
Here is what this camera/lens combination can do:
Hope this is helpful,
Bill