I've tried taping down the pins but it doesn't work for me. Some adhesives hate me.
No, screwmount lens apertures cannot be controlled by ANY cameras -- except maybe some variant M42 systems with specific film bodies and lenses, maybe those with extra pins. Standard M42-auto lenses only have the single pin, which stops-down the lens to the aperture you've set. So the most an M42-auto camera can do is stop-down the aperture. The user must still twist the aperture ring themself. That's so on dSLRs also. The bodies just have no way to change the f-stop.
I own a K20D, a couple PK-mount film cameras, and several M42-mount cameras, some with aperture automation (auto stop-down) and some without. I have stopped buying M42-auto-only lenses because they only function fully on M42-auto film bodies. Otherwise, they're a pain.
Note: I've read of a costly M42-PK adapter with an internal flange that holds the pin in. No in-camera aperture control, but at least auto-only M42's would be usable on dSLRs. Maybe I'll look for one of those, when I have money again.
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