David Mullen ASC
Moderator
So if you are on a sub 10k budget indi film and you have a shot planned at f2.8
(I dunno, some candlelight romance where actors can't move) then neither scarlet 2/3 can do it.
I don't think you understand, or maybe I don't understand... you can shoot at f/2.8 on an f/2.8 lens, it doesn't make a difference whether you are shooting on a 2/3" camera or a 35mm camera in terms of exposure, only depth of field.
So you can shoot your candlelight scene just fine on a 2/3" camera at f/2.8, it's just going to have more depth of field to it than if you were using a 35mm camera, the equivalent look of stopping down by 2.5-stops. But how noticeable that extra depth of field is just depends on the shots -- close-ups, you'll probably not notice that the focus is deeper than usual.
So you can see it as an advantage, not a disadvantage - now you can shoot candlelight scenes at wide apertures on your 2/3" camera and have a greater chance of getting it in focus.
Yes, if a super shallow-focus look is part of the overall design of the movie, then you'd need DoF adaptors if you are using a 2/3" camera, except for the tight close-ups. But there's no law that you need a "35mm at f/2.8 look" for a movie, and besides, that look is shot-dependent. DoF falls off so quickly in close-focusing situations, and looks more shallow in long-lensed shots, that it's mainly medium-distance shots on short lenses where you have a problem getting more fall-off in focus. And in wide shots, generally everything is farther away from camera and look in-focus even in a 35mm movie shot at wide apertures (for example, a lot of people think of Kubrick movies as being deep-focus when they actually aren't, because of the use of wide shots + wide-angle lenses. It's just harder to tell that the DoF is shallow in those situations.)
In the big, long list of what makes a movie look "professional", shallow-focus is much further down the list, unless you are talking about the naturally deep-focus look of 1/3" video, which is a bit distinctive and thus may be desirable to disguise. But 2/3" DoF just looks like 35mm DoF slightly more stopped down than normal.