>> * Put an M or K class lens on your *ist-D >> * Set the mode selector to M >> * Switch on the camera. >> * Stop down the aperture (The meter stays on). >> * Adjust the Aperture ring (No surprise the exposure indicator >> displays the change). >> * Adjust the Aperture Wheel... (The shutter speed changes!)
This also works on the DS model. It's almost nicer to use than the semi-automatic "press the AE-Lock" button because you get the EV +/- readout and can target a precise offset from what the meter thinks might be ideal exposure. Godfrey

