Hi all, I'm actually finally putting my feature request list together. One thing I had was the option on the Df to use stop-down metering - that is, use Pv to stop the lens down, read the meter, and optionally use AE-L to lock the meter reading with the lens stopped down. Some older film bodies could do this. On, say, the D850, the meter takes a reading immediately before depth of field preview, and the meter doesn't work while stopped down (as far as I can tell, experimenting with a modern lens in spot meter mode). The viewfinder reports "AE-L" while the aperture is stopped down. The benefit to stop-down metering is that on a lens with no aperture coupling (pre-AI), you can set the aperture on the lens and the camera doesn't need to know. Ironically it's only the aperture lever that causes a problem - on an old tilt-shift lens with no aperture lever, you can just stop down manually and the camera doesn't know it's using anything but a wide-open aperture. The disadvantage compared with the "normal" Df approach of separately setting the aperture on the camera to match the aperture ring on the lens is that your exposure is locked. One could imagine the camera automatically stopping down, then metering, then flipping up the mirror - which would solve one problem, but delay exposure and mean you didn't know what settings the camera would pick in advance. Also I'm not sure that the current Df aperture system can do it - unlike the D8x0 series and single digit bodies, I believe you can't change aperture (moving the aperture lever) while in depth of field preview mode. I'd had this as a feature request for a while (only relevant to the Df, since there are few lenses with aperture levers but no AI coupling which wouldn't crunch the aperture ring on other bodies). I've just had a crisis of confidence because I notice Ken Rockwell's compatibility information and Df review suggest that you can use stop-down metering. But he might not have tried it when he wrote that, and just assumed it worked. I can't see any specific statement in the manual. Anyone with Df experience... does it work? (That is, if you use depth of field preview, does the meter still record changes in light?) I'm not sure you'll need a pre-AI lens mounted to make it work, but it would be more definitive. Just trying to do my research before bothering both the members of this forum and Nikon with my list. Thanks!