Focusing problem

[landon_christensen]

Hey everyone

my canon rebel xt will focus great in the middle but as it goes out from the center it gets blurrier towards the edges. Is this a normal

thing? I have the 17-85mm Is usm lens mounted.

 

 

Landon

[mike_oflaherty]

<p>Now are you referring to using the other focusing points just the center focus point? If that's not the issue it's the depth of field which is quite normal. Quick explanation of the depth of field it like when you look at some thing its nice and sharp and all around it is out of focus a bit, just the same with lens. Lower the F more blur, faster shutter speed. High F slower shutter, less blur. this can be compensated with higher ISO. Somewhere between f8 and 16 is the best results for a picture with over sharpness throughout the frame. Have fun, by the way the are no bad questions it's the only way we learn.<br>

Mike</p>

[jonathan_lui]

<p>Did you read the responses to all your posts? You know, the ones where you say you were cleaning your focusing screen and a copper shim fell out.<br>

Losing the shim probably caused your focusing screen to be lopsided, you'll need to fix it so that your focusing is correctly positioned. Send it to Canon, or some who knows how to fix this. Posting differently worded questions wont help.<br>

Did you check the images on the card if they were out of focus as well? Your focusing screen problem shouldn't affect autofocus, but the viewfinder will appear out of focus.</p>

 

[garymoncur]

<p>Landon you have had this problem addressed and answered in 3 previous post as Johnathon has said. You either repair the screen or live with it. Your photos should be unaffected its just your viewfinder. Dont ask for advise then keep ignoring it your just spamming the forum now.</p>

[landon_christensen]

Well sorry Mr. Gary :)

[landon_christensen]

I replaced my copper shim and when I looked through the view finder and say focus on a street sign in the center of the

view finder but if I move the street sign to the corner it is slihtly blurry.

[garymoncur]

<p>We didnt know you had had the shim replaced and its very likely connected (anything else would be unlikely) you should have mentioned it. :-( <br>

Unfortunately I cannot shed any light on the issue but anyone trying to help would probably be better to read your previous posts as it may help resolve it. I am assuming by the speed of the repair it was not done by Canon? Anyway good luck with a solution.<br>

As an afterthought, did you manage to replace the shim yourself ? The focusing screen is probably just not perfectly parallel to the focal plane. (Terminology wont be right but you get my drift)</p>

[steven_f1]

<p>Send you camera in for repair. If you put the shim in yourself it's still not right. At this time the only way to know is to have Canon look at it. </p>

[thomas_risberg]

<p>Maybe you put the screen in upside down causing the imperfect view through the finder.</p>