thats what I just said ? think you are really just not understanding me , we are saying the same thign i just use iso to refer to digital and asa to film as has tradinonally been donebut again we are saying the exact same thing <| sep |> Yeah man the only thing stopping me from robbing banks is time constraints . <| sep |> My crazy ? I ' m perfectly normal . Nothing crazy about me . Except for the whole believing I ' m infallible part , but that ' s perfectly reasonable because it ' s been a long road getting from there to here , a long road , but my time is finally near . <| sep |> I completely agree with uDisappointingOutcome . You can have on hand as many as you want assuming you have your device with you . If you use certain services you can read the books where you left off on PC , Android , IOS , etc . It generally is a convenience thing . A lot of the time , book applications come with some kind of markup tools you can do .