Focusing And Composing - Pentax MV-1 Manual

FOCUSING AND COMPOSING
The focusing screen inside the viewfinder of your
MV 1 is a split-image type surrounded by
a microprism collar. For precise focus, turn the
focusing ring of the lens until the two images in
the split-image circle at the center align as one.
If you find focusing with the split-image circle
difficult, focus with the microprism collar by
turning the focusing ring until the glitter
disappears from inside the collar. In addition, the
field surrounding the center spots may also be used
for quick focusing: merely turning the ring until
the image comes in clear in the overall viewfinder
field. The surrounding field also gives bettter
results than the center spot when using telephoto
lenses having a small maximum aperture.