I came across my first aluminium RD Artar---amazingly lightwieght! I was wondering if, aside from the benefits of a lighter lens, there are any pros and cons regarding having one mounted into a shutter, as opposed to the older brass Artars? (I suppose the aluminium version wouldn't be much help in beating off a brunching mountain lion, but I was thinking along the lines of more conventional usage) I wouldn't think there would be a difference, but maybe someone here can enlighten me in case there is.------Thanks!