<p>Paul:<br>
Yes it is correct that EV scale is connected to shutter speed lever - so to change shutter/aperture combination and keep same EV level, shutter lever is moved with clicks only at full stops 1/15th of a sec, 1/30th of a sec, 1/60th of a sec and so on. I do not know if setting the lever between 1/15 and 1/30 will produce 1/23 if a sec - if Rolleicord's shutter is stepless then yes. <br>
EV scale can be set with 1/3 increment via shutter lever - so one can have value of EV 11, 11 1/3, 11 2/3 set.<br>
Again please note I do not use EV settings, so my explanation might be not clear enough - for me interlock between shutter and aperture in a nuisance, I have to remember that shutter lever changes shutter speed and aperture at the same time.<br>
All best.</p>