Need help with focus issue moving subject - examples

Canon 450D - 3.5fps - I always shoot in 'One shot' because I'm primararily a landscape photographer, however, today had an opportunity to shoot my dog...

HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

You may need to delve into your Custom Functions to insure that the AF settings are adjusted for your shooting style. Look in your manual or on the Canon Learning Center website. http://www.learn.usa.c​anon.com …icle.shtml?cate​goryId=121

First, you should always try to have the EXIF info included in your images to give us a clue to where the problem originated. Using PS, "Save As" will include the exif & give a slightly larger file size. "Save For Web" strips the exif out.
EXIF info is in post #3: Using a Watermark / Copyright

Second, looking at #3 I see the grass it's on looks fairly sharp & it's in the center where your most active focus point is (should be! - check that.), & 1/800 sec should be enough to stop a dog running toward you. This makes me suspect the OS setting.

If it were me, I'd go out to the street & shoot some cars coming toward me at different OS settings & also at 1/800 - 1/2000 sec & evaluate what you get.

Looks to me in pics 3 and 4 that there is a patch of reasonably sharp focussed grass just behind the dog. Makes me think that the lens and camera were sufficiently steady but that the AF wasn't keeping up with the dog - at least that's what I've found with some of my pics. I'd go with a greater depth of field (ie smaller aperture) and trade that with either a slower shutter (1/400 should be ok) or higher ISO. F/4 on your lens at a longer focal length is a pretty thin depth of field.

did you use all focus points? or did you select the center one?

Having the same issue..
Here is a screen shot from Canon Solutions Software.
It shows the focal point on my dog, as you can see he is the only thing not in focus!!
I have been doing a bit of reading online about "BACK BUTTON AUTO FOCUS"..


Camera Model Canon EOS DIGITAL REBEL XS
Firmware Firmware Version 1.0.7
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/1000
Av( Aperture Value ) 7.1
Metering Mode Evaluative Metering
ISO Speed 200
Lens EF28-135mm f/3.5-5.6 IS USM
Focal Length 135.0mm
Image Size 3888x2592
Image Quality RAW
Flash Off
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style Landscape
Sharpness 4
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Long exposure noise reduction 0:Off
High ISO speed noise reduction 0:Off
File Size 9599KB
Dust Delete Data No
Drive Mode Continuous shooting

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

fisheye10 wrote in post #13946932
It shows the focal point on my dog, as you can see he is the only thing not in focus!!

Well, if you tried this "go out to the street & shoot some cars coming toward me at different OS settings & also at 1/800 - 1/2000 sec & evaluate what you get." & had no issues, then maybe your AF motors are slow as adrianSE suggested. I have a lens where the motor seems to be dying right now.

fisheye10 wrote in post #13946932
Having the same issue..
Here is a screen shot from Canon Solutions Software.
It shows the focal point on my dog, as you can see he is the only thing not in focus!!
I have been doing a bit of reading online about "BACK BUTTON AUTO FOCUS"..

Camera Model Canon EOS DIGITAL REBEL XS
Firmware Firmware Version 1.0.7
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/1000
Av( Aperture Value ) 7.1
Metering Mode Evaluative Metering
ISO Speed 200
Lens EF28-135mm f/3.5-5.6 IS USM
Focal Length 135.0mm
Image Size 3888x2592
Image Quality RAW
Flash Off
White Balance Mode Auto
AF Mode One-Shot AF
Picture Style Landscape
Sharpness 4
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Long exposure noise reduction 0:Off
High ISO speed noise reduction 0:Off
File Size 9599KB
Dust Delete Data No
Drive Mode Continuous shooting

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO

One shot AF?? should be servo on moving subjects.

Rick, That looks everything is in move in your first pic. If the cam was really fairly still, as you wrote, than the IS is able to make resonance. So try to switch off the IS in similar cases. Anyway the short exposure time, what you used, does not justify the usage of IS.

SteveJa wrote in post #13948377
One shot AF?? should be servo on moving subjects.

Damn! I missed that!