AF point still blinks in MF???

Just bought a Canon 17-40mm, and I noticed after switching to MF, the AF point still blinks and flashes when I press the shutter button. The lens doesn't focus and maintains exposure, is it normal for this lens.

Thank you for your time.

in MF mode, and you are in One Shot focussing, if the camera thinks that it has achieved focus for the selected focusing point, it will beep and acknowledge focus. this is normal.

try this: in MF, move the focus wheel to infinity, then slowly achieve correct focus. your camera should beep and you will see the red indicator blink when it has achieved focus.

Yep, though I don't know how it works you can even get adapters with focus confirmation chips for older manual focus lenses.

The autofocus sensors in the camera are still operational regardless of whether or not the lens has an autofocus motor. The reading from the AF sensors is used to produce the focus confirmation.

Personally I find focus confirmation much too tolerant for regular use at wide apertures.

So when it beeps in MF, can I trust in 100%? The whole point of switching to MF is to focus by hand and eye precisely why would this feature be useful?

saralee wrote in post #6000728
So when it beeps in MF, can I trust in 100%? The whole point of switching to MF is to focus by hand and eye precisely why would this feature be useful?

because peoples eyes can mis-focus