This question may seem weak ( dumb )..yet I will continue. I am in the process of trying different films..I am doing this in 120 format for convience & practicality. I set the setting as per instructions ( iso ) and develope the same ( time , mixture, temp and agitations ). Sometiimes the negs are thin and sometimes too dense..is there any way to tell if it is a wrong iso setting or too much or little developement. Of course I can adjust the exposure or developement for the final result..but is there a clue or observation to guide ones direction.