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https://www.dpreview.com/forums/thread/4452729
Some older AF lenses have aperture rings just like totally manual lenses
lenses without this are designed to be controlled by the body.
If you are adapting these then it's down to the adapter.
Some are 'smart' adapters which translate the aperture signals from body to lens (with varying degrees of success), there are others that have a control ring that operates lens linkages (not found on EF), a few have an iris built into the adapter and the remainder do nothing to the aperture.
There is a trick I've heard reported for EF lenses - set the desired aperture on an EF body with the lens mounted, press & hold the DOF preview & dismount the lens. Apparently this leaves the dismounted lens at the set aperture. I've not been able to check as I don't have an EF body.
example :
https://youtu.be/y1ZuK_dDweg
https://youtu.be/YlVEOyW7NKI
so id need to make an adapter that has a lever to push on the aperture co trop inside the lens :
![](Screenshot_20240222_231739_app.rvx.android.youtube.jpg)