Pentax KM KM Manual - Page 11

5. ROTATE DIAPHRAGM RING The needle moves as you turn the diaphragm ring. When the needle on the right side of the viewfinder image is at the center, you will get correct exposure. If the needle does not come to the center no matter how far you turn the diaphragm ring, change the shutter speed. When the needle is close to the (+) mark, you will get an over-exposure; change the shutter speed to a faster setting. If the needle is closer to the (-) mark, you will get an under-exposure; change the shutter speed to a slower setting. 6. RELEASE SHUTTER Cock the rapid-wind lever. Hold your camera firmly and trip the shutter. Then cock the rapid-wind lever for the next picture. (When taking a series of pictures under the same lighting conditions, it is not necessary to repeat instruction 5.) •9