im new to this so i hope i get it right. i am in need of help with my light meter, i have a gossen digipro f . when i take a light reading the f stop number sometimes has a small number that appears with the large number. for instance it will read f 8.0 and then it will read f8.0 5 the 5 will be smaller than the other numbers and is to the right of them,i don't know what that is for can anyone help me out with that. thanks