Pentax Program Plus - Focusing; Diopter Adjustment

FOCUSING
You can focus in three ways, with the split-image,
microprism, and/or matte field. To focus using the
split-image, turn the focusing ring until the two
images in the split-image circle at the center of
the focusing screen are perfectly aligned. When
using the microprism collar, focus until the glitter
disappears from inside the collar. With the matte
field, focus until the image on the matte field
appears sharp and crisp.
Note: If the maximum aperture of the attached
lens is smaller than f/5.6 (for example, f/8 as in
the case of a long telephoto), it is easier to focus
on the matte field since the split-image and
microprism collar areas become much too dark for
satisfactory focusing.
Diopter adjustment for viewfinder eyepiece
People who wear eyeglasses due to myopia,
hypermetropia or presbyopia, sometimes find it
difficult to focus while wearing their glasses. In this
case, use the accessory diopter correction lenses
M {See page 53).