WetDog
lvl.2
Flight distance : 1131886 ft
United States
Offline
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All ETTR does is suggest that you fill up the right hand 'bins' in the exposure bucket first because you get more information (more photons) and less noise. You still want to capture the entire range of contrast (a flat picture) and then manipulate in post for desired effect. So a high contrast scene will have tonalities from light to dark - you expose for everything - while a flatter scene might not use the entire dynamic range.
What ETTR suggests to do in the latter case is make sure that all of those photons are in the brightest values because you can use less of them to get a darker exposure without dragging out noise.
The problem in video is you have another problem - the blurring effect between frames. When you want a digital video to look like a film shot because our brains have been taught that 'film is right' you need to have some blurring in each frame. Which means you have to shoot at slower speed than you would to get an acceptable still image (since blur in an anathema to a still image unless you are going for some sort of artistic effect).
On a P3, you can't adjust the aperture so the only thing you can adjust is ISO and shutter speed. And on the P3 you can't decrease the ISO below the base value of 100. So you have to slow the shutter speed. To keep the exposure somewhere where it belongs the only way you can do that is fiddle with an ND filter. If you underexpose, ie, don't 'shoot to the right' you will get a noisy shot if you try to bring up the exposure. But typically you are wanting to SLOW the shutter so you end up overexposing without an ND - even in Scotland.
The base problem is that the P3 has a very limited camera. Of course, the P3 cost less than a decent video camera monitor much less a lens or a camera body so DJI can only do so much.
The other way to do this is in post - blur the image in an editor. That's non trivial and if not done correctly looks really bad.
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