RED Cameras: Crop Factor and Frame Rates

The RED cameras bottle neck are their data transfer rates. Thus, if you want to shoot at higher frame rates, only a part of the sensor's pixel area will be used¹, while the decision for high resolution atomatically means lower frame rates. Listed modes are a selection only:

Resolution (width x height, max. FPS): Crop

Epic Mysterium-X:

5K (5120 x 2700, ≤95fps): 1.4x
4K (4096 x 2160, ≤120fps): 1.62x
3K (3072 x 1620, ≤160fps): 2.17x
2K (2048 x 1080, ≤240fps): 3.25x

Epic Dragon:

6K (6144 x 3160, ≤82fps): 1.3x
5K (4096 x 2160, ≤95fps): 1.4x
4K (4096 x 2160, ≤120fps): 1.62x
3K (3072 x 1620, ≤160fps): 2.0x
2K (2048 x 1080, ≤240fps): 3.24x

Scarlet-X:

5K (5120 x 2700, ≤12fps): 1.3x
4K (4096 x 2160, ≤30fps): 1.62x
3K (3072 x 1620, ≤48fps): 2.17x
2K (2048 x 1080, ≤60fps): 3.25x

Format and Crop Factors for comparison

Sensor	Width	Height	Diagonal	Crop
Format	mm	mm	mm	Factor

16mm	10.3	7.5	12.74	3.39x
Super 16	12.35	7.42	14.41	3.00x
1"	13.2	8.8	15.86	2.73x
BMCC (0.94")	15.8	8.9	18.13	2.29x
MFT (4/3")	17.3	13.0	21.64	1.99x
APS-C*	22.3	14.90	26.82	1.61x
Super 35	24.89	18.66	31.11	1.39x
APS-H**	28.7	19.1	34.47	1.25x
35mm***	36.00	24.00	43.26	1.00x

* Canon APS-C sensor sizes vary from 22.2 x 14.8mm to 22.7 x 15.1mm, while by watching the evolution of their sensors a size of 22.3 x 14.9mm has been used in all later models. Many other companies use sizes of 23.7 x 15.6mm (Ø28.4mm) instead, resulting in a crop factor of 1.5x.

** Canon APS-H sensors also vary in size. The above size is valid for EOS 1D Mark I, II and IIN. Mark III featured a sensor sized 28.1 x 18.7mm, Mark IV a sensor sized 27.9 x 18.6mm and the old EOS D6000 even a sensor sized 27.6 x 18.4mm.

*** Digital full format derives from old 35mm film standard. Most of Canon's full frame cameras came with sensors sized on par with this specification, with the exception of EOS 1Ds Mark I (35.8 x 23.8mm) and EOS 5D Mark I (35.8 x 23.9mm).