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Occasional Contributor
Posts: 10
Registered: ‎01-18-2018

T7i Focusing Issues?

So... I've shot a few images with a T5i, and then with the T7i (both in manual, same settings, and using a 24-105 Canon lens), and I consistently find that the images shot with the T7i are always out of focus. The camera will tell me, when reviewing the images, where the focus point is, but even that spot is out of focus. The T5i seems to be doing a much better job with the same focus point (as close as possible, anyway) selected.

I tested this earlier, and set a manual focus point and shot a few photos of my sun playing on the deck with the camera in AI Servo. It pretty much missed focus every time. Could someone advise, please? I'm going to shoot some more photos with the camera in a day or two with the Tamron 70-200 and see what happens...

Occasional Contributor
Posts: 10
Registered: ‎01-18-2018

Re: T7i Focusing Issues?

by the way, I'm willing to share the photos if someone wants to have a look. Somehow.
Esteemed Contributor
Posts: 3,816
Registered: ‎06-11-2013

Re: T7i Focusing Issues?

It is possible that this is a focus callibration issue (this is done at the factory).  Camera's in Canon's mid-range and above (70D, 80D, 7D, 6D, 5D, & 1D series) allow for "auto-focus micro-adjustment" (AFMA) which lets you tweak the focus system if you find it's fractionally front-focusing or fractionally back-focusing a subject.  Rebel series bodies do not have the feature.  

 

You should test the camera by switching to live-view mode to focus and take a shot and compare that to what you get when using the viewfinder.  Live-view mode uses a different focusing system and it isn't subject to the same focus calibration that the normal view-finder focus system uses.

 

 

Tim Campbell
5D III, 5D IV, 60Da
VIP
Posts: 8,617
Registered: ‎08-13-2015

Re: T7i Focusing Issues?


@rgfoto wrote:
by the way, I'm willing to share the photos if someone wants to have a look. Somehow.

Use One Shot mode, and manually select the center AF point for every shot. Use a fast shutter speed, too.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Occasional Contributor
Posts: 10
Registered: ‎01-18-2018

Re: T7i Focusing Issues?

[ Edited ]

TCampbell, yea.. I got a 6D Mk2 coming in the mail. I'm gonna give that a shot as well before I call Canon.

Waddizzle, that defeats the purpose of continuous focus.. I need it to capture a moving toddler/race car/bar fight lol.
Plus, focusing and recomposing with the 24-105 continuously leads to out of focus images. Well, I suppose that could be because of the focusing issues I'm experiencing in the first place.

Esteemed Contributor
Posts: 3,816
Registered: ‎06-11-2013

Re: T7i Focusing Issues?

I do not recommend “focus and recompose” techniques unless you shoot with a broad enough depth of field that the error create wont matter.  

 

 

Use “One Shot” when you know your subject isn’t going to move.  Use “AI Servo” when you know your subject will be moving (focus distance will be changing).  Use “AI Focus” when you aren’t sure (AI Focus behaves as if you are in One Shot mode... but if the subject distance starts to change it will flip to behave as if you are in AI Servo mode).

 

One Shot mode uses “focus priority” and it wont take the shot until it thinks it has successfully locked focus ... and then stops focusing once that is achieved and it will then take the shot.  If the subject distances changes after focus is achieved it will NOT update the focus to the new focus distance.   You can probably already tell that this isn’t the mode to use when chasing young children.

 

AI Servo mode focuses continuously... but it wont chirp to tell you when it has focused and it WILL take the shot when you fully press the shutter button even if the subject you wanted to focus was NOT yet focused.  This behavior is called “release priority” (it takes the shot when you hit the shutter release ... aka “shutter button”).

 

You should NOT use “AI Servo” all the time.  It might sound like a good idea but the camera can be tricked into thinking something moved and begin updating focus when you hit the shutter release ... and you end up with an out of focus shot (that would not have been out of focus had you used “One Shot” mode for a stationary subject.)

 

In other words... there’s a reason Canon offers you all these modes ... because no mode is best for every situation.

 

 

Tim Campbell
5D III, 5D IV, 60Da
VIP
Posts: 8,617
Registered: ‎08-13-2015

Re: T7i Focusing Issues?


@rgfoto wrote:

TCampbell, yea.. I got a 6D Mk2 coming in the mail. I'm gonna give that a shot as well before I call Canon.

Waddizzle, that defeats the purpose of continuous focus.. I need it to capture a moving toddler/race car/bar fight lol.
Plus, focusing and recomposing with the 24-105 continuously leads to out of focus images. Well, I suppose that could be because of the focusing issues I'm experiencing in the first place.


A fast shutter speed is what you need fo capture moving toddlers.  Are you shooting indoors or outdoors?  If you are outdoors, then you should have sufficient light for 1/1000, or faster.  If you are indoors, then you may not get the shutter speed you need.  You would need a faster lens, like the EF 50mm f/1.8 STM, of the EF 35mm f/2 IS USM.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Occasional Contributor
Posts: 10
Registered: ‎01-18-2018

Re: T7i Focusing Issues?

[ Edited ]

@Waddizzle wrote:

@rgfoto wrote:

TCampbell, yea.. I got a 6D Mk2 coming in the mail. I'm gonna give that a shot as well before I call Canon.

Waddizzle, that defeats the purpose of continuous focus.. I need it to capture a moving toddler/race car/bar fight lol.
Plus, focusing and recomposing with the 24-105 continuously leads to out of focus images. Well, I suppose that could be because of the focusing issues I'm experiencing in the first place.


A fast shutter speed is what you need fo capture moving toddlers.  Are you shooting indoors or outdoors?  If you are outdoors, then you should have sufficient light for 1/1000, or faster.  If you are indoors, then you may not get the shutter speed you need.  You would need a faster lens, like the EF 50mm f/1.8 STM, of the EF 35mm f/2 IS USM.


You dont think that a 160 - 250 shutter speed is enough? I'll try a higher speed I guess.

That said, at times, my son was sitting quite still... so I donno. I'll continue testing.

VIP
Posts: 8,617
Registered: ‎08-13-2015

Re: T7i Focusing Issues?

[ Edited ]

@rgfoto wrote:

@Waddizzle wrote:

@rgfoto wrote:

TCampbell, yea.. I got a 6D Mk2 coming in the mail. I'm gonna give that a shot as well before I call Canon.

Waddizzle, that defeats the purpose of continuous focus.. I need it to capture a moving toddler/race car/bar fight lol.
Plus, focusing and recomposing with the 24-105 continuously leads to out of focus images. Well, I suppose that could be because of the focusing issues I'm experiencing in the first place.


A fast shutter speed is what you need fo capture moving toddlers.  Are you shooting indoors or outdoors?  If you are outdoors, then you should have sufficient light for 1/1000, or faster.  If you are indoors, then you may not get the shutter speed you need.  You would need a faster lens, like the EF 50mm f/1.8 STM, of the EF 35mm f/2 IS USM.


You dont think that a 160 - 250 shutter speed is enough? I'll try a higher speed I guess.

That said, at times, my son was sitting quite still... so I donno. I'll continue testing.


No, not for moving subjects.  I use a wide aperture lens, which helps a little to keep high ISO under control.  Learn to use the Creative shooting modes: Av, Tv, and M.  The P mode is good for learning about the camera.  I mostly use M with ISO Auto, and set an upper limit to ISO in the menus.

 

[EDIT]. Be aware that if your toddler is less than ten feet from the camera, the DOF [depth of field] can make your photos seem to be out of focus, OOF.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Highlighted
Occasional Contributor
Posts: 10
Registered: ‎01-18-2018

Re: T7i Focusing Issues?

I shoot manual.

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