Pentax LX LX Manual - Page 20

FOCUSING The Pentax LX comes equipped with the standard SC-21 split-image/microprism focusing screen which provides a split-image center spot surrounded by a microprism collar on a matte field. The SC-21 is fully k interchangeable with eight other focusing screen models to provide focusing versatility capable of meeting almost any picture-taking need (see page 43). When using the split-image center spot simply turn the lens focusing ring until the broken image in the center spot in the viewfinder aligns as one. When using the microprism collar surrounding the center spot, rotate the lens focusing ring until the "shimmering" effect in the collar area seems to disappear. The matte field is quite handy for focusing in rapidly changing conditions where there simply isn't time to w use either the split-image spot or microprism collar or for focusing with long telephoto lenses having small apertures. To focus, turn the focusing ring on the lens until the image on the matte field appears sharp and crisp. • 18