Hi there fellas!
I'm currently working on a feature film as a 2nd AC and there's someting the focus puller and I have been discussing for the past few days that we've been unable to puzzle out much as we try. The camera we're shooting with is the Alexa Mini LF and a set of Arri Ultra Primes. Here's the thing:
We were facing a shot involving two actors and at some point while measuring distances we broke bout pCAM app to compare the DoF of the LF we're using and the Alexa Mini. To our surprise the app showed greater DoF in the LF than in the Mini, which definitely made our heads blow:
Camera 1
Alexa Mini LF Open Gate
Focus Distance: 2,5m
Aperture: f4
Focal Length: 50mm Total depth: 0,45m
Camera 2
Alexa Mini Open Gate
Focus Distance: 2,5m
Aperture: f4
Focal Length: 50mm Total depth: 0,38m
What do you make of this? Shouldn't there supposed to be shallower depth of field with a greater sensor as of the LF? To my understanding the greater the sensor the shallower depth of field, but there's clearly something I'm missing here...
Please help! Your insight will be very much appreciated! Find attached the screenshots.
Thanks