I have a 1100D canon camera which when i press the shutter button, nothing happens except the lens continuously tries to focus, but does not focus, thus does not allow picture to be taken. any suggestions??,

closed as unclear what you're asking by Philip Kendall, scottbb, Michael C, MikeW Jan 1 '17 at 22:56

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    How far away is your subject? Does taking a photo with manual focus work? What steps have you taken to try to resolve the issue? The more information you provide, the easier it is to help you resolve your problem. – NoahL Dec 26 '16 at 5:28
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    Does this happen every time, or only in some conditions? Which conditions? Does it happen with all lenses? – mattdm Dec 26 '16 at 16:22
  • When you press the shutter button at what is your camera pointed? Is it lit well enough for the AF system to work? Does it have enough contrast (difference between the lightest and darkest parts) for the AF system to work? How far is it in front of your camera? Is it closer than the lens' minimum focus distance? – Michael C Dec 27 '16 at 1:41

I've observed with my camera that when I try to capture a dark image with higher than required shutter speed the auto focus keeps on focusing but image doesn't get captured. The thing I've noticed is the camera needs some light to capture the image. If it can't exceed it's threshold it won't allow you to capture it hence, no click.

Hope your lighting is correct.

This usually points to insufficient light for the camera to determine whether the lens is in focus.

Alternatively, teleconverters can also cause autofocus failures by making the lens's widest aperture be too small to let enough light in for proper focusing (particularly in low light, but sometimes even in bright light).

If neither of those is the issue, then your lens could have decentered optics that prevent it from ever getting the image properly in focus, or you could have something physically wrong with the actual AF sensor (mispositioned, loose, covered with dust, etc.), or you might have chosen some wildly incorrect AFMA (automatic focus microadjustment) settings.

The first things I would try are:

  • Ensure adequate lighting
  • Choose a smaller set of focusing points, and make sure they are on the subject
  • Ensure that you are not closer than the lens's minimum focusing distance (typically 3–4 feet unless it is a macro lens)
  • Ensure that you don't have serious smudges, cracks, chips, or scratches in the glass on either end of your lens
  • Make sure you aren't seeing double-image problems caused by cheap window glass (or amazingly poor quality filters)
  • Try a different lens

If all else fails, switch the lens to manual focus.

  1. What is the aperture you are shooting at? Some cameras will have difficulty in locking the focus if you shooting at lower aperture like F7.1 or F9.

  2. Try to move to a well-lit area where the contrast difference of the objects is clear. If the autofocus system is contrast detect AF, it will struggle to focus where there is not enough distinction between colors.

If none of the above works try manual focus and use shutter release button, to narrow dos the issue to lens or camera.

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    -1 for the first point. Just about every camera, and definitely the 1100D, acquires focus with the lens wide open, so it makes no difference what aperture you're shooting at. – Philip Kendall Dec 26 '16 at 8:01
  • I was referring to photo.stackexchange.com/questions/16399/…. It doesn't mean that that is the reason. Thanks for the down vote – Shibu Thannikkunnath Dec 26 '16 at 20:24
  • a) that doesn't manifest as "difficulty locking the focus", it manifests as "no autofocus whatsoever". b) do you really think that the OP is using a lens with a maximum aperture of f/7.1 or f/9? Exactly which lenses are you referring to? – Philip Kendall Dec 26 '16 at 21:09
  • Well, I'm not talking about the maximum aperture of the lens but the aperture OP is shooting at. – Shibu Thannikkunnath Dec 26 '16 at 22:52
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    @ShibuThannikkunnath The aperture OP is shooting at doesn't matter. The OP's camera meters and focuses with the aperture wide open. The lens isn't stopped down until when the mirror is swinging up out of the way the instant before the picture is taken. – Michael C Dec 27 '16 at 0:02

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