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If you set one of the function buttons on your anikon as a Preview, I think that is what it’s called, it sets the aperture blades while you’re looking through the view finder as a way of judging depth of field and the like.
If you hold the preview button down while the camera is on and remove the lens with the aperture blades set at what you want, the aperture remains set.
I’ve done this with my Sigma Art 85mm numerous times.
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