I think BlackMagic cams are a good thing, albeit a bit behind the times in useability, but if they keep at it and update their current cams they can be an awesome thing to work with.
There are three ways to shoot motion footage. Easy, hard, super hard.
Easy, I phone 6, a few attached lenses and a sound kit with a go pro for crash cam. This actually works better than most people think and you kit will fit in a small satchel.
Triple J is right that a go pro can be amazing, though I really don't like them, for small crash cams, outside of cars, or under skateboards, high above, they are amazing little devices.
Hard. Tricked out dslrs, a Red Scarlet/Epic with Canon lenses, a Canon c500, and a black magic anything and of course trying to figure out what Sony sells, what lens goes on, what recorder is made to get to the frame rate you want and when they will actually ship.
The BMCPC needs to be viewed as a sensor and screen only. It needs a small cage, (I found a great one in London) and a sound pre amp (also from London is one made for smart phones) and of course battery power, which requires a bunch of small batteries or a second part gold line, v lock or lithium holder (you have to look around but there out there and easier to find than you'd think.
The thing about the bmpc it's a 3x sensor compared to still 35mm. The metabones ef adapter makes it 1.75x and will allow for canon lenses with image stabilization, but NOT canon dg lenses (aps c) because the flange goes back too far, but will take sigma dg stabilized lenses. I mention this because Canons 17 to 55mm with ois and a constant 2.8 is one great video lens.
Also remember you will need either ND filters or a fader which I suggest Tiffen as it's between the higher end BH and the lower end chinese faders.
super hard, is of course real cinema work. Actually if you want to learn about using multiple cams on a large project read all you can find about Anthony Dod Mantle and how he filmed the movie Rush, using Canons, Arris and Go Pros, graded on set to match them up. BTW: Since this movie was shot on a tight budget no one over the line (including ADM was paid), but the footage is amazingly good and inventive.
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Everyone loves to compare footage, as image makers we look for sharpness, file quality, things that most people don't see, but in the end if the highlights aren't blown, the story is solid, the filming inventive the camera becomes somewhat secondary.
The only issue with cheaper cameras is they take a lot more work in post to get right than more expensive cameras.
When I set down to first light grade, I loathe dslr footage in medium key and high key work, love RED and black magic footage and the difference in time to get a look is 4x more with the cheaper cameras.
DSLR footage is generally pretty in low key. Go figure.
IMO
BC