larryepage wrote:
...Why do we think there is such a disparity in the acceptance of automatic exposure vs. autofocus, especially since various forms of automatic exposure have been around longer than autofocus?[/b]...
It's really pretty simple...
Autofocus, when used correctly, is faster and more accurate than I ever was shooting manually. I take more shots and more of them are well focused, thanks to autofocus. I shot sports and wildlife with manual focus gear for a couple decades. And I was darned good at it, too!. Even so, now using AF I am able to take shots I never could before. It's faster than I ever was and more accurate! Focus is either right or it's wrong. There's no middle ground.
I don't use the "latest and greatest" AF systems with face and eye detection. Maybe some day I will. I sort of feel that takes automation too far. I'd feel like I wasn't "doing my job" as a photographer, giving up all focusing decisions to the camera in that way. Even with these innovative new features, as good as they appear to be, I still feel selecting a single AF point and me working to keep it right where I want camera & lens to focus will produce the most "keepers"... In most situations will give me the most images where focus is nailed.
However, I'm also the first to admit that there are times single point focusing is difficult or impossible to do. There are times when subjects are moving very quickly or unpredictably, where face or eye focus could well do a better job than me. And I'd have no hesitation using it. I'd probably be more likely to use it than "zone" or "group" focus, which leaves more up to chance.
It's not the same with auto exposure. There are times and places it works very well. But there are also many times when a camera's reflective metering system is "fooled" into making incorrect exposures... Times when I can do a better job setting it all myself or when I need to intervene to tweak AE with exposure compensation.
It's the same with auto white balance.... often it works very well. But there are other situations where it doesn't. Since I mostly shoot RAW, it doesn't matter very much because I can easily change color temp and tint later in post-processing. But when I shoot JPEGs I will sometimes set a custom white balance in situations where I know auto WB won't give the results I want.
Exposure and white balance are also more open to personal preference and interpretation that can vary from shot to shot, where focus is much less so.
Even if automation were able to make a "perfect" exposure every time ... There still would be situations where I'd want a high key effect, deliberate over-exposure. Other times I may want a silhouette and need to use under-exposure. It's similar with white balance. Sometimes I might want a warmer look... other times something cooler. I usually leave those adjustments to post-processing, since I shoot RAW. But if I wanted I could tweak things in-camera.
Auto exposure is far from "prefect" though. It gets fooled A LOT.
larryepage wrote:
...let's please set aside the question of whether "Auto ISO" is or is not part of "manual exposure." It's been discussed thoroughly elsewhere without resolution...
uh? How can there be a disagreement or lack of "resolution"? When M is used with Auto ISO, it's no longer "manual". Period. Auto ISO makes M another
auto exposure mode. There really isn't any room for discussion. It's
auto exposure any time the camera is making some of the exposure decisions, as it does with aperture priority, shutter priority, program
AND Auto ISO + M (as well as certain flash modes). It's only truly "manual" exposure when the photographer is making all the exposure decisions and settings: M
without Auto ISO (also B on some cameras).
I'm not disparaging "auto" or "manual". The different orms of auto and manual exposure have their uses, depending upon circumstances. I have no idea what your "position" on this might be. I didn't know differing positions were even possible. It's simply a fact that when Auto ISO is enabled with M, it becomes another form of auto exposure.
I know there are some folks who shoot with their cameras set up that way while espousing "manual exposure" as if it were the holy grail and while swearing the only way to shoot... even though they actually aren't doing it themselves.