Barry Goyette
Second Officer
Flight distance : 14928 ft
United States
Offline
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Um...no it's not.
Technically, native ISO on the x5s is 100. All other ISO's are gained from there. ISO 400 is offered as an optimized ISO, but from our testing, DR in EI mode is the same at all ISO's except 1600 which may have one more noisy half stop in the shadows. ISO 500 isn't possible in EI mode.
ISO 400 will give you approximately the same noise as the old 500. Cinecore 2.1 seems to make the X5s rather ISO invariant, meaning there is almost no penalty for pushing in post versus gaining in camera. They will both give you the same results. The key for low light photography is to use an ISO that produces a "light" result, and then "pull" the image down in post, this will give you a less noisy result. So when using ISO 800 at night, open up your aperture as much as possible, don't use ND, and possibly use a shutter speed that is slower than double the frame rate. i.e. 30p normal shutter would be 1/60...maybe use 1/40 or 1/30. In camera, your result should look like it's somewhat overexposed (without clipping important highlights). You will see less noise in the picture this way, and then when you grade "down" the shadow noise should be crushed and will be less apparent. |
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