Hi I am a *total* beginner having been recently drawn in by plastic cameras. I've just acquired myself a Zeiss Ikon Nettar through the magic of eBay. It looks to be in good working order and I've just loaded it with film to see what it can do. I am a little confused though because the camera has two red windows on the back, and I'm not sure when I wind the film on, quite how far I should be winding it! At present the '1' is visible in the first, left hand window. is that correct? When I wind on will I be taking it until the 2 is in that window? In fact what is the point of the 2 windows? many thanks in advance!