Pentax K20D Viewfinder

The Pentax K20D's viewfinder is an optical through-the-lens type, with the LCD monitor also able to display an image preview, in Live View mode.

Pentax says the K20D's viewfinder provides a magnification of 0.95x and a coverage of about 95% (coverage is a little higher than that, according to our tests). The K20D's dioptric correction adjustment (for eyeglass wearers) has a range from -2.5 to +1.5 diopter. The eyepoint is unspecified. The Pentax K20D's viewfinder is a pentaprism design, which is more costly but brighter than the K200D's pentamirror implementation.

The Pentax K20D's viewfinder readouts do a very good job of communicating camera status and exposure settings, showing most of the usual info such as AF points, flash status, focus mode, shutter speed, aperture, focus confirmation, ISO sensitivity, EV compensation, anti-shake status, etc. See the diagram below for the complete list.

Viewfinder Test Results

Accuracy
Good accuracy from the optical viewfinder, very good from the LCD.

70mm, optical	70mm, LCD

The Pentax K20D's optical viewfinder coverage was a bit better than average, showing about 96% coverage. That's a little better than the company's specification of 95%. LCD coverage in Live View mode was slightly more accurate, at just over 98%, though not quite as good as Pentax's claimed 100% coverage.