Cameras forum

General discussion

Query on auto-exposure

On full auto exposure mode, does a camera first "focus" on shutter speed or aperature opening, i.e. while looking for the correct or optimal exposure combination of settings, does it first exhaust the available range of aperture openings then go to the next shutter speed, or does it first exhaust the range of shutter speeds then go to the next aperature opening ? And only when these are exhausted, go to the next ISO setting ? Or is the camera intelligent enough to make settings "half-way" ( i.e. sensing that a shutter speed is too low, so use the next ISO)? And how does it determine when to use flash ? Thanks.

christy

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Auto Mode

In reply to: Query on auto-exposure

Good question..........but....

All of that information is buried in the camera's firmware, and not available to the general public.

That is similar to asking Microsoft for the source code to Windows.

The different camera makers use different algorithms for setting exposure.
They even differ on cameras from the same maker.

They do not release that information and do consider it proprietary.

Better yet ..... what algorithm do they use for the various scene modes?
If we knew that, we could use scene modes more effectively.

But they are not going to tell us, because that would be telling their competitors.

...
..
.

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Well...

In reply to: Auto Mode

...I guess that is one reason why cameras with seemingly the same features and specifications take different quality photos.

christy

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A question to ponder.

In reply to: Well...

Christy and Snapshot, an excellent question and response. It demonstrates the complexity of digital photography. So often we don't think about what happens when we snap a picture.

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