It depends on which AF arrays you're using. In the xxxD and xxD cameras, the horizontally oriented rectangles see vertical liines only--they are blind to horizontal lines.
The service CD is the CD full of software that Canon uses to do such things as:
I always paid attention to whether there is only one contrasty thing within AF sensor, so I tried to give AF the best possible conditions. But I just learned that AF sensors are actually bigger than the indocators. I'll have to do my tests again.
I think it was just repeated many times in various forums, but it seems now to me that you're right.
If someone did know, it could throw some light on the issue. But I'd expect that AF check of whether in focus or not is the same in both modes, AF or MF. So if it confirms wrongly good focus in MF, it probably does the same in AF, resulting in random focus results.
Yes, that theory does make sense.
Yes, I know that, and in MF mode it also should work this way.
Jason, thanks for your input! I'll have to read it carefully yet to make sure I understand it all.
Sounds right. I did some tests on my 18-125 comparing true AF and MF with focus confirmation, and indeed the AF errors are very similar: the lens frontfocuses in AF, and gives erroneous focus confirmation in MF when I focus in front of the subject...
Yes, so far, everything understandable. But what is not understandable in my case, is that 300D + 24-70 confirms focus not in specific point, but in some range. This is what I cannot understand...
Unfortunately, I don't get impressive results in MF by eye only
--Jason, thanks for your input! I'll have to read it carefully yet to
make sure I understand it all.
But knowing all this about how AF works, could you risk an
interpretation why 300D + 24-70/2.8EX confirms focus in MF mode
seeing both images below?
This is 100% crop of the image, roughly the area around central AF
sensor, which was the only one activated, no reframing after
focusing.
--
Regards, Wojtek
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I don't even see a near miss on the second image, which leads me to believe that something else went wrong.Here you are, downresed to 25%:
in focus:
out of focus:
If transfer limit on my free account runs out and you cannot see
pics, I'm sorry, but for some time there should be no problems.
--
Regards, Wojtek
Never mind, I read the posts on this topic. It's too damn bad that Canon keeps them under wraps. I really wish these companies would take a more open approach. Yes, it would cost them some money, but there would also be significant benefits.
