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While trying to shooting at 2500 ISO in a dark music jam, when I push the shutter it just stays open, the plus/minus exposure dial through the lens flips to far left, and I have to change the setting to make the shutter finish.. then no shot... do I have wrong settings somewhere that is causing this.? I have a 35mm 1:1.4 lens attached...Canon

  • In which mode do you take the photo? – Romeo Ninov Mar 14 at 19:38
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    Sounds like the mirror lockup feature is turned on. – Mike Dixon Mar 14 at 19:49
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    Are you stating that, if the only thing you change right now is the ISO (let's say, back to 100), this behavior goes away. But, if you change the ISO back to 2500, this behavior appears? – Hueco Mar 14 at 21:02
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    This could be several things... can you provide more info on specifically which shooting mode (M, Tv, Av, or P, etc.) AND also which metering mode (Evaluative, Partial, Spot, or Center-Weighted) you are using (see: support-sg.canon-asia.com/contents/SG/EN/8200355300.html ) For a low-light concert, I'd probably use "Partial" (which only uses metering zones near the center of the frame and ignores the rest). Concerts often have "black" backgrounds ... making the camera think it needs a much longer exposure to bring up details in the black background. – Tim Campbell Mar 15 at 14:10
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Well, without knowing anything about your Canon settings beyond ISO, there could be several culprits:

1) You have a Canon SLR and have turned on "Mirror lockup" so depressing the shutter once flips up the mirror, turning the viewfinder black. If you press the shutter release a second time, the camera will take the photo and then flip the mirror back down again. Here's the Canon KB entry on 5D Mk II mirror lockup -- so many different behaviors.

2) You are in Full Auto or Aperture Priority mode and ISO 2500 isn't nearly high enough (easily possible in a dark studio). The camera is selecting a long exposure time and you are cutting it off by changing modes before it is done.

3) (Less likely given your description): You have set the shutter speed set to "B" for "Bulb" exposure. The shutter stays open as long as you hold down the shutter release.

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    There's a subtle clue in the title as to which model ;-) – Philip Kendall Mar 20 at 16:15
  • Haha! Totally missed that. – the_limey Mar 20 at 16:25
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2500 ISO is not actually very high. Indoor lighting is much dimmer than people usually assume (human vision is remarkably adaptive). In a "dark music jam", it is very likely that even if you have your aperture wide open at f/1.4, a long shutter speed is required.

In other words, everything seems working as designed and expected.

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