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Aperture mode or Shutter mode Sometimes you want to control for depth of field -A mode- Sometimes you want to control for motion blur -T/S mode- -Edit- Also
by ctrl-j 7y ago
Aperture mode or Shutter mode
Sometimes you want to control for depth of field -A mode-
Sometimes you want to control for motion blur -T/S mode-
-Edit-
Also, you usually don't want to adjust ISO to fix over/under-exposure. Shoot to your camera's native ISO unless you literally don't have enough light or your exposure is super off. Try to use the lowest or closest to native ISO as you can, and use the cameras built in metering adjustment feature (e.g. if you're under exposed tell it to over-expose by a stop or two...)
- davinic 7y agoCameras have a min and max ISO, not a "native" ISO.
- mark-r 7y agoYes they do have a native ISO. It's generally whichever ISO produces the greatest dynamic range.
- ctrl-j 7y agoCamera sensors have a base sensitivity that will capture an image without additional voltage applied to it. Adding voltage allows the sensor to capture more information, at the cost of additional noise. The lower ISO values are also not usually the native, instead they are simulated in camera. The camera algorithms are pretty good these days, but they can still end up with clipping sensor data that you might want. The native ISO isn't usually published along with typical product specs, but you can usually find it by searching online.
- megaman2 7y agoThat's not entirely accurate. The native ISO ("base sensitivity") just means no analog gain is applied. This is a fairly complex area, but to simplify - for non-dual gain sensors - the sensor captures the same amount of information regardless of ISO setting. The ISO setting then determines how much analog gain to apply, and also how much digital multiplication to apply (if the ISO setting is outside of the analog gain range). No additional information is captured at higher ISO values.