You should try holding your breath or something to deal with those hiccups , Airbags . <| sep |> Yukon gold , even . <| sep |> Shhh he doesn ' t realized he ' s been trapped yet . <| sep |> Well see one of the things about film is that it has lots of exposure latitude . When I shoot film , I basically only shoot 400 speed film TriX for BW , Portra for color but I almost never shoot it at ISO 400 , film or digital . It ' s just not an ISO that works well for what I like to shoot . So during the day time , I ' ll shoot my 400 speed film at 200 ISO , and during golden hours when I don ' t have my strobes , I ' ll shoot my 400 speed film at 1250 or 1600 . No worries , the pictures will still come out . In fact , 400 speed color negative film looks better when you shoot it at 200 ISO . Unlike digital , you have to try really , really hard to blow the highlights . That ' s why whenever you google for Portra 400 or Fuji 400 H , it often looks overexposed . The exception to all this is of course slide film , which has the exposure latitude of a potato chip . But after Provia died , nobody makes 400 speed slide film , so no worries . TLDR 400 speed film is typically very forgiving , so while you ' re supposed to shoot it at ISO 400 , it doesn ' t really matter within reason