In the UK it has been snowy the last few days and I have been out with my Pacemaker Speed graphic 4x5 shooting 100ASA Provia using a Weston Master IV for metering - the question is how much should I bias the exposure for a snowy scene? I'd been guessing about +2 stops but unlike 35mm braketing is not practical - any general rules of thumb? Regards and Thanks Gareth Rees