Chuck Alaimo said:food for thought from another topic ---http://www.canonrumors.com/forum/index.php?topic=21908.msg417183;topicseen#new --- only 5% of the buying public buys more than 1 lens apparently. That leaves 95% with a kit lens. What to venture a bet as to what percentage of that 95% never even take a peek at their manual? What percentage of that 95% even knows what an AF point is? LOL....that is why AFMA won't be in a rebel! How many users are in P mode would end up messing with their AFMA because they have blurry shots - because they don't know their shooting at a slow SS? Or because the AF is locking on to other things (all point active!!!). I would love to have more faith in humanity that this wouldn't happen, but, time and time again I get questions from the first time DSLR user and yup, theynever even opened the manual, hell they don't know where it is and ----yeah they look at me like I'm Satan for asking....I paid $$$$ for this and it should just work. UGGGGGG....no no no no no....AFMA just has no place in the rebel line....
Actually, I'd go the opposite direction. The Rebel bodies should have their kit lenses pre-AFMAed as part of the initial burn-in and packing process. That way, non-advanced users won't ever even have to think about it.
Don Haines said:and most of those people shoot in "green box" mode.... do you really want them to be doing a complex and precise calibration sequence on a tool that they do not know how to use? AFMA is hard for advanced users to get right....
Only because Canon didn't bother designing an AFMA UI that makes sense for non-advanced users. There's nothing even slightly complex about AFMA in principle. The UI just sucks harder than a Hoover.
Instead, the camera should just provide a one-button-press option to recalibrate the currently attached lens, and should hide the AFMA values from the user entirely. I would envision something like this:
Would you like to calibrate this lens?
[YES] [NO] [DON'T ASK ME AGAIN]
Please set the zoom to its widest setting.
[Waiting]/[OK]
Please put the camera on a tripod and aim it at something more than 50 feet away.
[Too Close]/[OK]
I'm having trouble. Please make sure the camera is on a tripod, aim it at something far away, then press OK.
[Too Close]/[OK]
No, seriously, you [expletive] dolt, put it on a tripod.
[OK]
Calibrating.
(At this point, it flips the mirror up and down repeatedly, focusing in alternation between live view and normal mode. Periodically, it kicks the focus way out and repeats this process. Then, after about twenty flips, it continues.)
Please aim the camera at something about 5 feet away, then press OK.
[Camera goes into servo focus mode.]
[Too Close]/[Too Far]/[OK]
Calibrating.
(At this point, it flips the mirror up and down repeatedly, focusing in alternation between live view and normal mode. Periodically, it kicks the focus way out and repeats this process. Then, after about twenty flips, it continues.)
Please set the zoom to its narrowest setting.
[Waiting]/[OK]
Repeat these screens:
- Please point the camera at something more than 50 feet away, then press OK.
- Calibrating.
- Please point the camera at something about 5 feet away, then press OK.
- Calibrating.
Done calibrating.
[OK]
That's the sort of UI that you need when designing a feature like this for end users. From there, you calculate the mean AFMA value and the standard deviation. Then, throw away any outliers, and recompute the mean. If the standard deviation is too high or there are too many outliers, display the "make sure the camera is on a tripod" screen. Otherwise, use the resulting mean (with outliers removed) as the AFMA setting.
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