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One of the more common questions is why the aperture on one's vintage K-mount lens does not close when one rotates the aperture ring. The reason is that it has a fully automatic aperture mechanism. Assuming that "aperture ring" is enabled in the custom setting menu and that your lens does not support aperture control by the body,* it will only stop under the following:
- At exposure time
- When using optical DOF preview
- When the green button is pushed and then only in M mode
I only mentioned that to be sure we are on the same page. If this sounds familiar, it is because your K-1 deals with vintage lenses in a manner similar to your K-30. Since the lens works fine on the K-30, is it possible that you are in a User mode where the aperture ring is not enabled?
Steve
* No "A" contacts or aperture ring off the "A" position