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#How to change iso in aperture software manual

There are plenty of types of long exposure photography where this would be the case.

You actually want a longer exposure time than the camera's automated routines will give you.

You are using TTL flash and would prefer use more flash power to light your subject brighter than the ambient light rather than use higher ISO to boost the ambient light and use the flash only as a "fill" light.

With any "auto" exposure mode the camera has no idea how much light you are adding and will attempt to expose the scene "properly" using ambient light.

#How to change iso in aperture software manual

Changing exposure compensation or metering mode can sometimes do the same thing, but it's often easier to get consistent exposure from frame to frame under difficult lighting conditions by using fully manual exposure mode to keep Tv (time value or exposure time a/k/a shutter speed), Av (aperture value a/k/a f-number), and ISO the same for every frame.īeyond that, there can be plenty of other reasons: Left to its own devices, that is what the camera will attempt to do with every frame.

Not every scene needs to be rendered with an overall average brightness of medium gray. The primary reason to set ISO, along with shutter time and aperture, manually would be to totally control exposure manually rather than let the camera set exposure. Is there any reason to change the ISO manually, rather than have it set automatically?