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I have a Canon EOS Rebel T5 camera and I've been running into an issue lately that I do not know how to solve.

The autofocus while using viewfinder does not work at all; I could not even take a photo. The lens will zoom in, and out whenever I half-press the shutter. However, the camera will autofocus when I use live view instead.

Is this issue something I can fix myself? Or should I bring it in to have it checked out?

  • What lens are you using? – Michael C Aug 29 '17 at 12:15
  • What happens if you try to focus through the viewfinder by setting the active focal point on a high contrast transition of a day lit object? – user50888 Aug 29 '17 at 17:28
  • I'm using the EF-S 18-55mm f/3.5-5.6 IS II Lens. – Hillary Chua Aug 29 '17 at 23:34
  • The camera still refuses to autofocus through the viewfinder when I try to focus on a day lit object. I may bring it into a repair shop if the problem persists – Hillary Chua Aug 29 '17 at 23:36
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You can try at least following and see if any of it helps :

  1. Viewfinder dioptric scroll: maybe it just is rotated off your eyesight correction. This is most likely not the case, since you can't take photo w/o Liveview, but anyway first thing to check.
  2. Try to change focusing methods as per Rebel t5 manual.
  3. Try switching lens to MF and back again.
  4. Try changing lens AF point.

If any of the 2-4 helps, it would sound a technical problem with lens.

Best bet to make sure is try another lens on. If the problem persists, it would be with camera.

After this, the best bet would probably be repair shop.

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Live view on the T5 would, I think, be using contrast detect for focus and non-live view focus method is phase shift.

These have different pros and cons and sometimes you can get focus with one and not the other.

Both focus methods will be affected by the amount of available light. No focus system likes low light but, again, one may be better than the other depending on the scene and circumstances.

The phase shift focus system is entirely separate from the main sensor and it may be a fault in that that is causing the problem, but also make sure it isn't just e.g. too little light for phase shift to work. The contrast detection system is using the main sensor itself.

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