Question about Canon EOS 40D Digital Camera

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Canon EOS 40D aperature issue

I shoot in Manual mode, it was working fine but now I have lost control of the aperature & can only adjust the shutter speed

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  • dpeterson Jul 15, 2008

    if by 'activate' you mean have the power switch in the apropriate position this does not work.







  • VinnyC01 Jul 24, 2008

    Mine is also stuck at 5.6 in manual and almost all other modes except AV and TV. Any suggestions before I call canon?

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Check the operators manual - you need to 'activate' the aperture control.

Posted on Jul 15, 2008

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Shutter working very slow in AV or P mode, will only work in Auto Was trying out my new lense today when this happened a EOS 75-300 Canon Lense Worked for a short while, when i put my other lens on it...


If the camera works fine in fully automatic mode, but onot in AV or P, it is likely your settings. Trying increasing your ISO (larger number) and increasing your aperture (smaller number). If you don't have sufficient light or a fast enough lens, the shutter be force to operate more slowly. If the camera also has issue in automatic mode, then I would try the following:

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ISO stays on Auto. I push the ISO button to change the ISO off of Auto and it doesn't do anything on my 40D


The ISO is set to Auto and can't be changed when shooting in Basic Modes (all of the icons and the green circle). ISO can only be adjusted in Creative Modes (P, Av, Tv, A-DEP, M). If you want to adjust the ISO in Creative Mode, press the ISO button and then turn the dial next to the shutter trigger.

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How do I change the aperature in the manual mode. As I change the shutter speed using the top dial, that works fine however, I'm having trouble using the dial on the back to change the aperature. What...


Make sure that the power switch is in the correct position.
It actually has three positions:
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  • On (with quick control dial disabled!)
  • Third position (quick control dial enabled!)
So, when the power switch is in the middle position (ON), the rear control dial is disabled in order to save you from inadvertently changing the setting, when you are wearing the camera on a neck strap.
So be sure to put it in the third position.

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I have a Canon EOS 40D When I switch it on all appears fine. When I take a photo the shutter remains open & all power is lost. I then need to remove & re-install the battery to recover power. I can...


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If both cards are causing the same results, double check the camera settings - set to full Auto mode and take a shot of a brightly lit scene (or set to manual mode set the lens to wide open (lowest f number f2 to f5 or so) and exposure time to 1/250 - 1/500 and shoot a brightly lit scene. If the shutter opens & closes as expected, double check the settings - as the camera is probably OK, but just set wrong. if still having problems, it might need a vistit to the repair shop. Good luck!

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Focusing issues with canon 40D when taking sports shots


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Can't adjust aperature in manual mode.


1. Check the power switch is pointing to the rear dial (not "ON") or you wont be able to set your aperture.
2. Try shooting one image for each position of the mode dial on the top. Then review each image to see what mode the camera indicates the image was taken.(Pressing info during playback will bring up detailed information to show this) If the recorded setting and actual setting dont match, this indicates a fault with the dial.
3. If the camera does not display an aperture, or shows "00" then there is a communication fault with the lens. Check the contacts are clean and sitting correctly. You can confirm this lens is at fault by trying another lens on your camera,I'm sure a photo store could help with this.
Good luck!

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Canon EOS 40D shoots on its own.


Sounds like a software issue, try to upgrade or reload the firmware.

I hope it helps :)

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Canon EOS 40D shooting in RAW


You are quite correct!!! RAW only works in any of the creative/manual modes.

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Manual shooting mode problem.


The exposure compensation dial (at the back) doesn't work when you're in Manual. In Manual, you set the shutter speed and aperture to get an image with the amount of over- or under-exposure you need. In the view finder, the "exposure meter" at the bottom shows how much light there is where the lens is pointed. When it shows what you called "2-stops", its really underexposed. Thus your black images. You need to increase ISO, open the aperture and slow down the shutter speed (or a combination of these 3 options)

Set your camera to P or full-auto. Do the photos turn out ok? If they do, then there's nothing wrong with your camera and you just need practise on the Manual mode.

Aug 13, 2008 | Canon EOS 40D Digital Camera

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