I'm testing a new to me 65 year old camera, and it is a very heavy beast. I own three light meters, Two old Zeiss Ikon Ikophot, and the scrabble tile sized Reflx - I just didn't want to mess with a fiddly meter and try and hold the beast. So I looked up one on my phone (android version). Did you know (of course did) that there is a great free photo light meter called "Light Meter - Free". Just shot a roll - inside and outside 1./30th to 1/500th of second. They are all spot on! Speaking of spots - you can slide your light reading circle of interest wherever you want the reading using the phones camera. Anyway, thought there might be someone here that would be interested.