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Occasional Contributor
Posts: 12
Registered: ‎12-04-2013

Re: rebel auto focus problems

right....i didnt even touch the af/mf button on the left hand side of the lense.....but when i started having auto focus problems ...i wondered if i was suppose to be switching that back and forth everytime accourding to auto focus setting on the camera or manual settings on the camera...my lense in auto focus started sounding sticking when i would try to use it for auto....so that is when i starting looking at other buttons...and turning the lense focus manually which would damage it..now that i know that..cuz i looked at pg 33 like u referred to earlier...you can focus the upclose or away but do not try to turn the lense focus in auto focus cuz it will damage it...learned the hard way...

Reputable Contributor
Posts: 780
Registered: ‎06-11-2013

Re: rebel auto focus problems

[ Edited ]

Just to clarify...

 

There are three major components that go into auto focusing a modern camera: the camera itself, the lens on it, and the user operating the two of them. To be honest, it sounds as if you don't have a thorough understanding of auto focus and using it with your particular camera and lens, so I'm leaning toward "user error", rather than any problem with the gear. Not to worry, we've all been there at one time or another with our cameras! Maybe this will help...

 

First of all.... There is no "auto focus vs manual focus setting" on the camera itself. None at all. The only place you can actually  turn AF on and off is at that switch on the lefthand side of the lens. If you want to use auto focus, this switch must be set to "On". And If you want to focus manually, this switch, on this particular lens, must be set to "Off".

 

On this type of lens, if you operate manual focus by turning the focusing ring on the lens.... effectively overriding autofocus while it's trying to operate.... you will damage the autofocus mechanism. (Note: There are Canon lenses that allow what they call Full Time Manual or "FTM", overriding of AF while it's operating... Most "USM" lenses can do this. But yours is not a USM or Ultrasonic Motor auto focus lens. So you must turn AF off at that switch, before manually focusing the lens. Feel free to zoom the lens, though. That will do no harm, but see below for more info about focus and zooming.)

 

So if you have been in the habit of manually overriding the focus of your lens without first turning off AF at that switch on the LH side of the lens... it's possible you have damaged the AF mechanism. Maybe this is why you had to replace your previous lens, if the AF failed.

 

Now, what's found on the camera body itself are several other things related to auto focus...

 

On the camera, you can choose the mode of auto focus: One Shot (for stationary subjects), or AI Servo (used to track focus with moving subjects), and AI Focus, which isn't really a focus mode at all... it's supposed to decide for you whether or not the subject is moving, then switch to use the correct mode. (I never use it, I decide which mode I want to use myself.) To change from one auto focus mode to another on your camera, you first press the button marked "AF" - on the back, RH side, about 2/3 of the way down (actually it's the "East" button of the 4-way controller) - then turn the dial on the top fo the camera to scroll through the modes and make your selection.

 

Also on the camera, you can choose the AF point or points (as seen in the viewfinder), that you want the camera to use to perform auto focus. You can choose to have the camera use all the points and hope it automatically selects the point of focus for you correctly, or you can select any single one of the points yourself (note: the center one is more sensitive, faster and more accurate on most Canon cameras). To do this, press the AF Point Selection button, which is on the back of your camera, far upper RH corner (also doubles to magnify the images when reviewing them on the camera's LCD, and is marked in blue with a little magnifying glass with a + sign inside). Then scroll through the individual AF points with the dial on top and/or using the 4-way controller buttons on the rear of the camera. When you scroll all the way to the edge, all the points should light up and you are back in "all points/auto selection" pattern.

 

The last thing related to auto focus on your particular camera is the shutter release button itself, which you are probably quite familiar with. When you half-press it, you activate or start AF (also IS and metering). Releasing the button fully stops AF. Halfway pressing it again starts it up again. If you are in One Shot mode (stationary subjects), auto focus runs until the camera senses focus has been achieved, then it stops, locks and gives you Focus Confirmation (green LED in the viewfinder and, if you have it enabled, and audible "beep"). If you have the camera set to use AI Servo mode, autofocus starts and runs continuously as long as you keep the shutter release button halfway pressed, tracking the moving subject and constantly updating. There is no Focus Confirmation in AI Servo mode because auto focus never stops and locks. You have to keep the selected AF point right on the subject, where you want the camera and lens to focus, continuously while doing this. If you have all points/auto selection set up, it is possible for a moving subject to be passed off from one focus point to another, which the camera displays in the viewfinder by lighting up the active AF point in red.

 

(Notes:

There is another technique of controlling auto focus called Back Button Focusing, which can be set up on most or perhaps all Canon cameras and is particularly useful when using AI Servo with moving subjects, though it also can be used with One Shot.... But I don't know if we want to complicate things at this point.

Also, some other Canon cameras have an "AF On" button on the back, that starts and stops the lens from auto focusing. Your camera doesn't have this button, but I wanted to mention it in case you see or hear reference to it elsewhere.)

 

Another key thing that can effect focus is that your 18-55mm is almost certainly a "varifocal" zoom. This means it does not maintain focus when you zoom and change the focal length (some more expensive "parfocal" zoom lenses do maintain focus). If you are using AI Servo it will automatically correct focus when you zoom...no worries. But if you are using One Shot, any time you zoom the lens you must re-focus afterward by lifting pressure off the shutter release button and reapplying the half-press. You should again get Focus Confirmation when you do this.

 

You might want to spend a little time viewing some online videos that do a good job explaining auto focus on Canon cameras. There are three videos, the first of which is at http://www.youtube.com/watch?v=iAx86nblZ2g. These three videos, each about a half hour long, talk about the auto focus systems on many different Canon models. Some things won't apply to your particular camera. But a lot of it applies to all Canon cameras and I think you might find it time well spent, viewing them.

 

Hope this helps!

 

***********
Alan Myers

San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & PRINTROOM 

 





 

 

 

 

Occasional Contributor
Posts: 12
Registered: ‎12-04-2013

Re: rebel auto focus problems

thank you for your info..it is a help to know these things...Smiley Very Happy

New Contributor
Posts: 2
Registered: ‎05-22-2017

Re: rebel auto focus problems after firmware update

I go to download the firmware update 1.1.2 and after the update, my lens auto focus stop working!!!!  Call the company and the only thing they tell you to send it to repair shop.   I am pretty sure the update software mess up my lense.  Sucks!  they release a version of software that potential (in my case definately) damaged my lens function!

 

THANKS Canon!, AND YOUR UNHELPFUL CUSTOMER SUPPORT! 

New Contributor
Posts: 2
Registered: ‎05-22-2017

Re: rebel auto focus problems

My lens AF stops working after i update the firmware to 1.1.2.  it sucks!  now it becomes manual only.  The new firmware mess things up!!!!  Be aware.



 





 

 

 

 


 

Esteemed Contributor
Posts: 3,493
Registered: ‎02-17-2016

Re: rebel auto focus problems after firmware update

Is it a third party lens? What rebel?

VIP
Posts: 11,642
Registered: ‎12-07-2012

Re: rebel auto focus problems

If there was a firmware update failure, the only recourse is to send it to Canon.

 

Before you ever upgrade the firmware, you need to know what it does.  Most firmware does not effect most users as it simply adds newer lenses.

 

Second a firmware failure is usually caused by the person doing the update.

 

Canon firmware and Canon cameras are not guaranteed to work with third party gear of any kind.  Especially goes for Magic Lantern.

EOS 1DX and 1D Mk IV and several lenses!
Honored Contributor
Posts: 5,067
Registered: ‎06-25-2014

Re: rebel auto focus problems


@marksman1000 wrote:

My lens AF stops working after i update the firmware to 1.1.2.  it sucks!  now it becomes manual only.  The new firmware mess things up!!!!  Be aware.



Very unlikely. But one thing a firmware update can do is alter any non-standard settings in the camera. Before you give up and send the camera in, make sure the settings are all as you expect them to be.

 

And are you sure you didn't accidentally switch the lens itself from AF to MF? Been there; done that.  Smiley Mad

Bob
Philadelphia, Pennsylvania USA
Valued Contributor
Posts: 371
Registered: ‎01-31-2017

Re: rebel auto focus problems


@slorff wrote:
why is there an autofocus/manual on the left hand side of the lense if you already change that on the right hand side of your camera???...is it because the camera button is diff from the lense??...i just had to recently buy another lense cuz mine was damaged somehow ...i never had to deal with this for the first 3 yrs of owning my camera...any insights will help me...Smiley Happy

Sorry, but your post doesn't make any sense. Download and read the manual. I feel confident that your answer lies there. 

 

www.canon.com/icpd

 

 

 

 

Honored Contributor
Posts: 5,067
Registered: ‎06-25-2014

Re: rebel auto focus problems


@John_SD wrote:

@slorff wrote:
why is there an autofocus/manual on the left hand side of the lense if you already change that on the right hand side of your camera???...is it because the camera button is diff from the lense??...i just had to recently buy another lense cuz mine was damaged somehow ...i never had to deal with this for the first 3 yrs of owning my camera...any insights will help me...Smiley Happy

Sorry, but your post doesn't make any sense. Download and read the manual. I feel confident that your answer lies there. 

 

www.canon.com/icpd

 


Er ... you're addressing that suggestion to someone who bailed from this thread more than three years ago.

Bob
Philadelphia, Pennsylvania USA
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