Canon EOS 400D / Rebel XTi Digital Camera with 18-55mm Lens Logo

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Question about Canon EOS 400D / Rebel XTi Digital Camera with 18-55mm Lens

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Halo around af points

When I look through the viewfinder of my Canon Rebel XTI, the AF points are blurred. I noticed a small halo when focusing(I had it set to focus with the middle point). I went to change the focus points and had them all lit up at once and the halo is around the 3 bottom points and the top point really badly and the others only slightly. I cant find anything on the net about it. I can't see that its causing a problem with my pictures, what should I do? What's causing it? I'm afraid to attempt to clean anything. PLEASE HELP!!

Posted by dreamshotz on

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Anonymous

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I have the very same happening to my 400D, I took it back to the shop that I bought it in and they said it was no problem and like you it doesn't do anything to my photos, Willie.

Posted on Oct 27, 2007

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What adapter do I need for a Sigma AF 75-300 lens on a Canon Rebel XTi SLR?

Question edited for clarity.

You get the Sigma lens for the camera in Canon fit.

https://www.google.com/search?q=sigma+lens+af+75-300+for+canon+rebel+xti

Can you use Sigma lenses on Canon cameras?
Since Sigma lenses are made to be fully compatible with Canon cameras, they are backwards-compatible. This means that you can use a Sigma lens on a Canon DSLR camera. Similarly, the Sigma cameras are backwards-compatible with Canon lenses. Macro adapter loses the AF feature.

https://www.google.com/search?q=sigma+lens+af+75-300+mount+adapter+ring+for+canon+rebel+xti
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I had this problem awhile ago - you must have accidently adjusted the focal area - it is sooooo easy to do without realising it. Here is what I was told:
**************************

Most likely, you have changed the AF point, which only takes effect in the creative modes (Manual, Av, Tv, P, etc)

There should be a button on your camera that has a grid like pattern above it, like
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