ISO 160x have a harsher highlight rolloff than ISO 100x.This might suggest that ISO 200 may be digitally pushed from 160. Some (or all) of these ISOs are either pushed or pulled digitally. In all 3 cases, the analog circuitry is configured at the same parameters. This means that all of them are obtained by different digital processing of the same RAW data. ISO 160, ISO 200 and ISO 250 are identical in RAW.ISO 160 has more highlight detail than ISO 200 (all other parameters being equal).or, in 8-bit space, know the response curve (and shift the image by 1 EV along that curve).either have access to raw data (and multiply raw data by 2 before developing it - for 1 EV).If you push by 1 EV, you brighten the image so that you get the same look (well, a bit noisier) as if you increase the exposure by 1 EV in the camera. it's just darkening or brightening the image digitally. In the image processing pipeline, this happens before the raw data above some preset level (let's call this white level) is clipped. Magic Lantern can alter the amount of digital ISO gain (either push or pull). My theory: the answer is somewhere in the middle. Theory 2: Multiples of 160 are digitally pulled by 1/3-stop (from 200, 400 etc), so they have 1/3-stop less dynamic range. Theory 1: Multiples of ISO 160 are native, and all others are digitally pushed. Reading through the 'net, I've noticed two theories: Many people believe that 160, 320, 640 and so on (the so-called native ISOs) are the best choice. Topic: what are the best ISOs in Canon DSLR, in movie mode? 2.8 Pink highlights: I've set DIGIC ISO gain at -1EV or lower, and now I'm getting strange colors.2.4 What should I use for high-contrast scenes? Should I try Highlight Tone Priority (HTP)?.2.2 Are ISO 100 multiples the best to use?.2.1 Are ISO 160 multiples the best to use?.1.2 Push/pull? Digital gain? What's that?.1 Topic: what are the best ISOs in Canon DSLR, in movie mode?.
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