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my camera Canon G9x Mark II goes to f/2, however on Av mode outdoors, it did not allow me to do so. why?

  • In what way did it not allow you? What happened? – Please Read My Profile Sep 5 '19 at 21:45
  • i couldnt choose f/2 which is what i wanted... the dial didnt turn. – Shoshana Rose Sep 5 '19 at 22:02
  • p.s. thanks for your quick response – Shoshana Rose Sep 5 '19 at 22:03
  • @ShoshanaRose The dial did not turn? Or turning the dial did not change the aperture setting? – Michael C Sep 5 '19 at 23:02
  • it's a digital on screen dial. it only "turned" within the black area between 3.9 and 11... the f/2 was grayed out. it didn't allow that as an option at all. – Shoshana Rose Sep 6 '19 at 1:11
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What does it do at that Av setting indoors? Shade? Reduced lighting?

My questions are based on the idea that, under your stated conditions (outdoors assuming bright daylight), the camera may not be able to adjust shutter and/or ISO sufficiently to give you a proper exposure. You know — protect you from yourself.

If the camera allows f/2 indoors/shade/etc, then that's possibly what's going on.

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  • indoors it allows me to go to f/2. so youre saying i have to adjust the iso outdoors? i thought it Av mode i pick the f stop and the camera picks the iso and shutter speed. – Shoshana Rose Sep 5 '19 at 22:01
  • p.s. thanks for your earlier quick response. i thought f/2 would work outdoors and actually it was overcast – Shoshana Rose Sep 5 '19 at 22:03
  • I think this is probably right: it has already picked the fastest possible shutter speed and lowest ISO, and has no more room to get correct exposure. But I don't know much about the intricacies of this specific camera. – Please Read My Profile Sep 5 '19 at 22:04
  • Yes - Av (aperture priority) mode allows you to choose f-stop. You tried to set it to f/2, wide open, but in the conditions present the camera couldn't produce a properly exposed photo. So rather than give you an over exposed photo it bumped your f-stop higher to cut down the light coming in. – user86484 Sep 5 '19 at 22:39
  • thanks all. i was surprised because it was overcast and i would imagine f/2 should work outdoors. ive watched youtubes where photographers are shooting outside at f/2 and the same ISO. – Shoshana Rose Sep 6 '19 at 1:12
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The most likely reason is that even using the camera's lowest ISO available and the camera's shortest exposure time (a/k/a the "fastest" shutter speed) available, the conditions under which you are shooting are too bright to get a proper exposure using f/2. So the camera limits you to the widest aperture that will allow good exposure for the light in which you are shooting using the shortest exposure time and lowest ISO of which the camera is capable.

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  • In AV mode, the camera should allow any aperture that it can physically achieve, even if it can then not achieve correct exposure. – damned truths Sep 6 '19 at 1:48
  • @damnedtruths What makes you say that? Are you the one who programmed the camera's automatic exposure routines? Compact cameras like the G9X Mark II often have built-in "safety shift" to prevent under or over exposure when using automatic exposure modes. – Michael C Sep 6 '19 at 11:49
  • Ah yes, just checked the manual. I hadn't realised that was a thing. – damned truths Sep 6 '19 at 12:58
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The lens on your camera does not have a fixed aperture. This means that if you are zoomed in at all, your widest aperture available will not necessarily be the same as when you are zoomed to the widest your camera can go. It is possible to construct lenses that have fixed (widest) apertures, but these are more complex, more expensive and heavier than variable aperture lenses, and hence are not ideal for compact cameras.

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  • oh! it's because of the zoom? i'll definitely test that out tomorrow. this sounds like it may be the answer. thanks so much! – Shoshana Rose Sep 6 '19 at 2:25

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