so...im brand new to the "medium to large format". first thing i noticed when "researching" a holga is it uses 12 or 16 length films...do all 120 size films come in these exposure lengths, or is there a place to buy like...bulk 120 film and load your own in those lengths? second, you can use any 120 film with it right? and whats the difference in the two plate things it has? i think they were 6x6 and 6x4.6? does the type of film depend on the one you use?