On my journey to crowd fund my film "Ticking Soul" I've been asked loads of times why I need the money to hire the Arri Alexa if I can use any DSLR for a much cheaper price.
I know that now the DSLRs are a fever among the filmmakers because of the considerable cheaper price and the creamy look with shallow depth of field you can get with the DSLR. Also the DSRLs are small and convenient to shoot in a low budget production. However, if you compare the dynamic range and resolution you can see why I've chosen to use the Arri Alexa.
First you have more latitude to play in post-production with the Arri Alexa footage. According with Nick Patonon Canon 7D X Arri Alexa latitude test (video). http://vimeo.com/17627567
Alexa has also 13.5 stops of latitude while the DSRL can go up to 11 stops (which is not bad). Another advantage of the Alexa is tha the image looks much smoother and sharper than the DSLRs, which look a lot softer and very video-y.
However the new 5D Mark III (for example) has a sensor which is almost twice as large as the Super 35 mm sensor on cameras like the Alexa.
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