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Message: <blockquote data-quote="aroy" data-source="post: 469381" data-attributes="member: 16090">As I had explained, moving the aperture ring moves the internal lever only. Here is what you can do to check whether the aperture is set, with the lens off the camera1. Set the aperture to max, say F/22. Look into the lens from back. The aperture is wide open. Now push the aperture feeler lever full. The aperture will have closed to F/22.2. Set the aperture to F/8. Look into the lens from back. The aperture is wide open. Now push the aperture feeler lever full. The aperture will have closed to F/8, which is wider than F/22.3. Set the aperture to min, say F/2.8. Look into the lens from back. The aperture is wide open. Now push the aperture feeler lever full. The aperture will remain wide open.So you have verified that the aperture changes with the aperture ring (but only when the shot is fired). The reason for this behavious is as follows. Initially the aperture would change instantaneously when you used the aperture ring.. This meant that though you got DOF preview always, at higher F stops the image would be pretty dark, so most of us would focus at aperture fully open and then stop it down for shots. In the heat of the moment that step was often forgotten, resulting in blown shots (that was in full manual era), and you realised it only when the film was developed.. So camera manufacturers came up with what some called "Auto Aperture". The lens would remain wide open (for ease of focusing), and when you fired the shutter, the aperture would change to that set by the aperture ring. In this case you always had a method of getting the DOF preview, where the aperture would close to the set value.</blockquote>

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