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VF-19
The old Pentax Spotmatics used a stop-down metering system with M42 (aka screw mount) lens. You flick a switch on the camera body, and it depresses the pin on the lens to close the aperatuere down to what you have it set for.
Also most M42 there's a little switch that sets the lens to auto (wide open, until you push the shutter) or manual (you have to manually set the aperature before you shoot).
Most later cameras have a depth of field preview lever mounted on the body that releases the aperature to what you've set it to, but you'll have to consult the manuals to find out which ones do.
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