AF misses. Canon

ThrillaMozilla wrote:

brightcolours wrote:

ThrillaMozilla wrote:

I just checked. My Canon will blink red to indicate which exposure spot is active in the viewfinder, but that definitely does not indicate an exposure lock. It is quite possible to get that blink even though the camera is not focused at all.

Yes of course. But it blinks and beeps when you have AF lock.

Yes, I think the beep is a focus confirmation if you have it turned on. (I haven't tested to be sure.)

You can get that blink even if auto focus is off, and even if it's not focused at all. I strongly suspect user error.

You can't take a photo in One Shot when you don't have focus lock.

Good point. But you definitely can in AI Servo, for example. I see you already mentioned that.

I don't know how misfocusing due to user error is possible in live view, but I'm not ruling it out

Some lenses can't focus in live view (depending on camera model), like the Tokina 12-24mm f4 and the Sigma 18-50mm f2.8 EX DC. This is because they take too large steps, where the contrast never really is there, and the camera just judges that from one step to the next there was less contrast, so it takes a step back (into unfocus). But I had this issue with 3rd party lenses with the 450D, not with Canon lenses.

The OP, in the original post, did not mention live view focus though. I may have missed it in another post?

Also, in live view you can set the camera to use the PD AF sensor for focussing. That then will give the same results as normal OVF shooting.

I downloaded the first picture, with the brick building. Unfortunately, the image is so strongly compressed that I could not diagnose the problem with any certainty.

Nonsense. You do not understand JPEG compression, it does not cause such unsharpness.

Ordinarily, not with these camera images. But if not compression, then what caused this?

The softness is caused by misfocus. The squares by JPEG compression.

Ohrid's first photo

Notice the characteristic incoherence. I would say this suffers from extreme jpeg compression at some point in the chain. AnthonyL also mentioned this. It's probably also seriously misfocused. From the asymmetrical horizontal broadening of the flagpole, maybe also serious camera motion, or possibly loose elements in the lenses.

I still suspect user error, although camera malfunction can't be ruled out. Loose elements in the lenses could cause intermittent focusing problems. Ohrid, have the camera or lenses been dropped or received hard knocks?