| Author | Message | ||
     M_currie Tinkerer Username: M_currie Post Number: 181 Registered: 07-2006 Rating: N/A |
Charlie: Manually set aperture or not, the lens is "automatic," in that you view and set aperture to the meter, both with the aperture fully open. Look at any relatively modern SLR as you set the aperture ring, and you'll see that the iris does not close. As in all such systems, the meter is reacting not to the change in light, but the change in aperture ring position. The iris itself doesn't close to the set aperture until you fire the shutter, whereupon a linkage operates it. It is here that the problem occurs, because it happens very quickly, and the blades must move very freely. |