For those that don’t already know, film — particularly Kodak’s Portra 400 — has a fair amount of exposure latitude. And by fair amount, I mean loads and loads.
In this particular video, Kyle McDougall exposure tests Kodak’s Portra 400 (currently available in pro packs only at B&H) in broad daylight using a Pentax 67 II. Exposure testing is not new or unique to Kyle. In fact, I previously exposure tested 11 color and B&W film stocks. In each of these examples, Kodak’s Portra 400 and Fuji Pro 400H was exposure tested.
Portra 400 is arguably the most famous film in the world and for good reason. The way it renders colors is excellent, and it’s almost too difficult to fail. Part of the reason for this is the exposure latitude. As Kyle and others have found, Portra 400 looks great overexposed a bit and can handle underexposure as well. I would argue that it handles underexposure by 2 to 3 stops just fine. Even better, it’s easily useable at 6 stops overexposed. While you may not think it's necessary to have such a wide exposure latitude, it comes in handy when shooting high-contrast scenes or when you're rolling with an all-manual camera and you aren't particularly confident with your camera's meter. Either way, Portra 400 is a great film stock, and you should pick up some and give it a shot if you haven't already!