I shoot with a Blackmagic Pocket Cinema Camera quit a bit. I avoid cDNG for the most part. I can see it’s value in broadcast or film work where you may have to push things very hard. You can push things very hard with ProRes though so unless you’re doing extreme grading or FX work, ProRes works fine
Key things to know is that shooting ProRes “burns in” the white balance and ISO setting which would only be meta data in cDNG. I haven’t that a disadvantage though since I get it close to where I want it when I shoot and post adjustments aren’t an issue.
[David Mathis] “If recording in film will I need to apply a LUT?”
I find I do better without that. It depends on why you’re applying the LUT. If it’s just for rough editing and you’ll later toss or tweak, that could work.
Keep in mind LUTs are not always the panacea they seem to be. If you tend to Expose To The Right or otherwise shot to preserve highlights, blacks, you have to first adjust exposure before applying the LUT. For me, if I have to do that, I then simply to a quick grade and apply it across similar clips in a scene. I use Color Finale. Usually I fix exposure with the “wheels” then add curves and I get my base grade. Of course if you want the look of a specific LUT I can see adding that after adjusting exposure so you have a quick “look” to show a client.
[David Mathis] “What quality will I give up by not shooting in Cinema DNG format? “
Not much. ProRes HQ should be fine even for broadcast work. Again no locked white balance or ISO with cDNG and you can push the grade a bit more extreme if you have to.
A few years back I asked ProApps product manager Steve Bayes if Apple would support cDNG wrapped in .mov in FCPX. He basically responded there’s really no need. You’re just not going to see the difference even in broadcast work.
Keep in mind Apple has since come out with ProRes 4444 XQ which is 12 bit, like cDNG rather than 10 bit which are the other flavors of ProRes. The Ursa and Ursa Mini can shoot XQ from what I understand although I haven’t used those codecs first hand.