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I talked to the Hikvision support and this is the info I got: Indoor mode: the exposure time is exactly you set. Outdoor mode: the exposure time is not exactly. Auto iris mode: the exposure time is exactly. Manual iris: the exposure time is upper limit. The image brightness is calculated...

Thanks for your response, I think you might be correct. Are there any workarounds? Might also be some inconvenient ones, as we have to do the calibration only ones.

Hello, I have question about our Hikvision DS-2CD4032FWD and hope that you can help me. We are using the camera to estimate the relative brightness of a light spot like this one: The problem is that the camera response is not linear, but rather logarithmic to match the brightness...