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To stop down, set the diaphragm clutch from auto to manual, and then select the desired aperture.
"Stopping down" simply refers to the closing of the aperture diaphragm. When using an automatic lens, you set the aperture via the aperture ring (or internally through the camera) and a lever on the camera "stops down" the lens to the desired aperture when you take the picture. You have to stop screwmount lenses down manually because they lack the coupler that K-mount lenses otherwise have. Edit: it looks like you have a very old takumar with two silver aperture rings. It doesn't have the diaphragm clutch, but I'm pretty sure that one ring stops the lens down while the other is just used as a guide for the other. Adam
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