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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 07 Mar 2009 (Saturday) 09:47
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10-22mm question... normal or defective..

 
shaolinmonk
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Mar 07, 2009 09:47 |  #1

Hey guys,

Just picked up a brand new 10-22 and have been playing around with it... mostly indoors so far today..

using it with an xs body..

other lens i have are the 50mm and a kit 18-55is.

anyway.. my 10-22 seems to have issue picking a focus spot sometimes...

it just keeps trying to "pick a spot" and keeps searching and searching...

never really noticed that problem with my other two lens... except the 50mm in lowlight sometimes...

anyone with any insight?




  
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JoYork
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Mar 07, 2009 10:24 |  #2

Is it ok outside or do you only get this problem indoors?


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briancmo
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Mar 07, 2009 10:29 |  #3

Couple things could be happening here

1) Your camera focuses by 'seeing' lines of contrast then focusing until the line is as sharp as possible. So, If you point it at a plain white sheet of paper, the camera will keep hunting for focus since there's not lines to focus on. If you add a straight black line to the paper and try the excersice again, your camera will use the thick black line and be able to lock focus.

2) Your XS allows your to choose a focus point. I think you have 9 AF points and if your camera is in auto, it will just bounce between those 9 and look for something to focus on. This can be frustrating as sometimes it focuses on your desired target, other times on a tall tree in the background...grrrrr! You can go into the AF selection menu and select which part of the AF sensor should use to focus (the middle, the left, right, upper...etc.). This way it will only focus on what's in that targeted area.

AF is a function of the camera, not the lens. It is possible that the lens' focus is off and will always backfocus or front focus, but I doubt the hunting is a result of a bad lens.

Good luck and post examples!


Brian
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Cl!ckFoto
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Mar 07, 2009 11:02 |  #4

are you in AI Servo trying to shoot a static subject? Put it on AI Focus and see what happens


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shaolinmonk
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Mar 07, 2009 13:20 as a reply to  @ Cl!ckFoto's post |  #5

hey guys.. so i switched to my 18-55 and tried to take pictures on the same things... and it's doing the same... so could it be something wrong with my camera..

it was on oneshot and now i moved it over to ai-focus.. same issue... i am trying to take a picture of a static object though... like the ceiling lol...maybe it's just me




  
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Brett
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Mar 07, 2009 13:34 |  #6

shaolinmonk wrote in post #7474698 (external link)
hey guys.. so i switched to my 18-55 and tried to take pictures on the same things... and it's doing the same... so could it be something wrong with my camera..

it was on oneshot and now i moved it over to ai-focus.. same issue... i am trying to take a picture of a static object though... like the ceiling lol...maybe it's just me

Read briancmo's post above again.

The ceiling likely doesn't have enough contrast to lock focus. Put focus in One Shot, select the center point and point it at something that isn't so bland, contrast-wise.



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shaolinmonk
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Mar 07, 2009 13:55 |  #7

briancmo wrote in post #7473965 (external link)
Couple things could be happening here

1) Your camera focuses by 'seeing' lines of contrast then focusing until the line is as sharp as possible. So, If you point it at a plain white sheet of paper, the camera will keep hunting for focus since there's not lines to focus on. If you add a straight black line to the paper and try the excersice again, your camera will use the thick black line and be able to lock focus.

2) Your XS allows your to choose a focus point. I think you have 9 AF points and if your camera is in auto, it will just bounce between those 9 and look for something to focus on. This can be frustrating as sometimes it focuses on your desired target, other times on a tall tree in the background...grrrrr! You can go into the AF selection menu and select which part of the AF sensor should use to focus (the middle, the left, right, upper...etc.). This way it will only focus on what's in that targeted area.

AF is a function of the camera, not the lens. It is possible that the lens' focus is off and will always backfocus or front focus, but I doubt the hunting is a result of a bad lens.

Good luck and post examples!

what you say makes perfect sense.. guessi usually don't point the cam at "nothing" so i've never noticed it bouncing around like that...

if i choose a focus point it will work....

thanks guys..




  
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10-22mm question... normal or defective..
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