Autofocus stopped working

S

SuperzShields

Junior Member
Suspended / Banned
Messages
82
Name
Ryan
Edit My Images
Yes
I took my canon 20d out of its bag this evening and when I tried to focus on something it was just searching back and forward then locking at one extreme. The lens I was using was a 55-250 and it is my only lens.

Can anyone help me with my problem and is there any way to determine whether it's the lens or body without having another lens?

Any help will be much appreciated
 
Well, you haven't given us much to work with, but here goes anyway......

What were you trying to focus on? It needs to be contrasty for the AF to work. It can't focus on a blank wall or a blue sky, for example.

How much light was there? AF can struggle in low light.

How far away was your target? All lenses have a minimum distance, inside of which they can't focus.

Repeat the tests tomorrow in bright daylight, using a contrasty target at a reasonable distance, and let us know whether you still have a problem.
 
I just tried again focussing on things like flowers and ornaments. In bright light it works if a little slower than it used to and it focuses all the way out then focuses where it should. In low light it either searches continuously or it just really really slowly moves into focus. It never use to have a problem at all so I don't know what's happened?
 
How far are you from the subjects? Low light will be tough especially when using a slow lens.

the centre AF point is also more sensitive than the outer AF points.

Lots of things could be causing the issue. As said above if the area has no contrast the camera/lens combo will struggle too.
 
Is your battery in good health? and I don't just mean fully charged.
Thoroughly clean contacts on body and lens and try again.
You've got to try the lens on another body and another lens on your body but hey! you know that already.
 
EOS_JD said:
How far are you from the subjects? Low light will be tough especially when using a slow lens.

the centre AF point is also more sensitive than the outer AF points.

Lots of things could be causing the issue. As said above if the area has no contrast the camera/lens combo will struggle too.
Click to expand...

I'm probably at least 1.5m away but some things close it focuses fine then further away it won't and visa versa
 
jackthekipper said:
Is your battery in good health? and I don't just mean fully charged.
Thoroughly clean contacts on body and lens and try again.
You've got to try the lens on another body and another lens on your body but hey! you know that already.
Click to expand...

How would I go about cleaning them? I tried another battery but to no avail
 
To be honest it sounds more like user error than actual lens/camera error'

IE your to close on the long end

theres not enough contrast for AF

aiming at the a bright or dark area
 
Just Dave said:
To be honest it sounds more like user error than actual lens/camera error'

IE your to close on the long end

theres not enough contrast for AF

aiming at the a bright or dark area
Click to expand...

That sounds probable due to me only just starting out but it just seemed strange to me that it had never done that before when I've been using it for the same thing then it started not focussing properly.

On further thought it seems even more likely as it's very random as to when it does and doesn't work as apposed to not working all the time
 
You must log in or register to reply here.
Back
Top