AmbientMike wrote:
But yeah, 5DsR, for instance, you're at about 5fps max, no EVF to power. Although its still surprising these batteries can supply enough power at -40° but you wonder how cold the battery actually is
The 5DsR drops from 5FPS to 3FPS when the battery is below 50%, regardless of temperature.
The camera temperature ratings are usually made from an equilibrated state. I don't know what protocol Canon uses, but one would expect the camera with battery and lens would be in a -40°C chamber overnight or however long that takes. In frequent use the battery and camera will warm and perform better, but the product should function with a partly discharged battery from a cold state. For example a person might deplete the battery 50% and then take a break, meanwhile the camera cools down. From what I have been told the cold time photographers store the battery between underwares and the clothing layers to keep it warmer.
EBH
Aug 14, 2025 at 11:25 AM
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