Margus Voll wrote:Yes this is all relative and FOV is that counts.
All mm stuff seems confusing
I have used some 3D apps and there all the parameters start with FOV on camera.
You have mm also but it is considered more like reference.
It seems the same here also.
I have lost track of what field of view you would like to have on the BMPCC stated in either angle of view (horizontal or diagonal) or the widest lens you plan to but on the BMPCC. Lets assume you mount an 8mm lens on the BMPCC for purposes of illustration. Here are approximate comparative horizontal and diagonal angles of view calculated from sensor sizes all normalized to a 16:9 aspect ratio and the nearest equivalent focal length of a lens on those other sensors giving about the same AOV:
BMPCC 75.9 degrees H, 83.7 degrees D, 8mm lens
BMCC 76.7 degrees H, 84.4 degrees D, 10mm lens
BMPC4K (and Academy 35mm film) 74.1 degrees H, 81.7 degrees D, 14mm lens
Super35mm film 75.8 degrees H, 83.5 degrees D,16mm lens
Full frame 135 stills camera 73.7 degrees H, 81.4 degrees D, 24mm lens
A normal field of view on these different sensors would be provided by the following roughly equivalent lenses on sensors normalized to a 16:9 aspect ratio:
FF 50mm, about 44.9 degree diagonal AOV
S35 35mm, about 44.4 degree diagonal AOV
BMPC4K 30mm, about 44.0 degree diagonal AOV - typically people will use a 35mm lens with an AOV of 38.2 degrees since there are only a few 30mm lenses available
BMCC 22mm, about 44.8 degree diagonal AOV - typically people will use a 24mm lens with a AOV of 41.4 degrees since there are no 22mm lenses available; a 21mm lens would result in an AOV of 46.7 degrees
BMPCC 17.5mm, about 44.4 degree diagonal AOV - typically people will use a 16 or 17 or 18mm lens with an AOV of 48.2 or 45.7 or 43.4 degrees
For those who need to know, here are the approximate crop factors calculated for normalized 16:9 sensors (don't fret if they are not what you have heard as people usually round the values so they are easier to remember):
FF 135 film stills 1.0x
S35 film 1.45x
APS-C Canon 1.61x (I thinks APS-C Nikon is 1.53x but don't shoot me if I am wrong)
BMPC4K (and Academy 35mm film) 1.70x
MFT 2.08x based on physical sensor width (Panasonic GH2 is 1.86x in user selected 16:9 mode)
BMCC 2.28x
BMPCC 2.88x
Everyone says the crop for MFT is 2x but that number comes from the sensor diagonals or the image circles to cover the sensor and they are not comparing sensors that have been adjusted for a 16:9 aspect ratio. You get a different crop value since 135mm film is 36x24mm for a 3:2 aspect ratio and the MFT camera sensors are 4:3 if I recall correctly. When all sensors are considered as 16:9, simply divide 36mm by the width of the sensor in question to get the crop.
All values here have been calculated by the iPhone app Angle of View.
Rick Lang
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