Question about Canon EOS 40D Digital Camera

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Exposure problem I have just purchased a Canon 40D. When shooting in Manual mode with an external flash, (photogenic) my exposure always looks correct thru the lcd but it always flashes -2 no matter what setting I have the camera on. What am I missing? I am relying on the camera's reading as my light meter is broken.

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  • 28 Answers

Your 40D requires that you use an ETTL-II type flash like the Canon 380-EX. What flash are you using?

Posted on Apr 16, 2008

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Canon 40d camera will only shoot in manual mode


Using your fingernail, push in the lens contact pins in the bottom of the mirror box several times. Sometimes they get tarnished and make poor contact with the flexible circuit under them. Doing this scrapes off the tarnish.

Screws come loose from the bottom circuit board and short it out. It contains the flash circuit so a short can throw 300 plus volts into a 6 volt circuit, damaging components. The lens contacts flex attaches to this circuit board. This is a common problem.

Impact can cause flexible circuits to either come loose from their connectors or have one side pull out so some of the lands on the flex don't make contact. Did you drop the camera?

Jul 29, 2014 | Canon EOS 40D Digital Camera

1 Answer

Inconsistant exposure in Manual mode


In manual mode the light meter result is the output of setting the apeture and shutter speed. It will constantly change as you change these and the ISO until you get the desired exposure. Is this what you mean by inconsistent? If it is giving verying results in the same conditions try it with ISO 100. That should fix it

Aug 04, 2009 | Canon EOS 40D mit 18-55mm / 55-250mm...

1 Answer

Images aren't very sharp


that is a good lense if its the one for the camera heres the thing clarity in a picture come from the exposure , the time the light is hitting the film or in digital the sensor . try cutting down the time speed up the exposure or change the f stop.
if it happens in all the modes it is a focus problem try shooting some test shots in controled light say 5 feet from a person inside and outside and see what happenes and consult the lab tech they can usualy show you on your camera how to set it up..
good luck

May 27, 2009 | Canon EOS 40D Digital Camera

1 Answer

Hi all, I wonder if you can supply some advice regarding a Sigma17-35mm lens I purchased earlier in the year. Basically if I use the automatic or 'P' setting on my Canon EOS 30D camera the image is over...


Try your EOS in AV (aprature value) mode. You should be able to adjust your aperature value in 1/3 or 1/2 steps dependind how you have your Custom Functions set in your camera's menu. Possibly the lens you purchased is for an EOS 35mm. If you use a 35mm lens on your eos there are some calculations you must use. When using a 35mm lens on the EOS 20D, 30D, 40D and 50D bodies, you must first calculate your focal leingth by 1.6 times. With this, your exposure changes as well.

The only EOS Digital SLR bodies that use a 35mm x 24mm CMOS sensor are the 1D and 5D. My wife uses a Tamron 18-200mm f3.5-5.6 lens on her 20D and loves it.

If this makes no difference, you may have a defective lens.

Nov 29, 2008 | Sigma Cameras

1 Answer

Canon EOS 40D shoots on its own.


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

I hope it helps :)

Oct 26, 2008 | Canon EOS 40D Digital Camera

1 Answer

Canon EOS 40D shooting in RAW


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

Sep 21, 2008 | Canon EOS 40D Digital Camera

1 Answer

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

1 Answer

Flash exposure does not work in Av and Tv mode


There is nothing wrong here - the camera computes the exposure as the flash is not firing. The flash will fire and it will adapt the power to the received light. You must go into M ot AV, fix your parameters and shoot. The flash will adapt to your whishes - only take care to not choose a shooting time to small (1/200 or 1/60 - you have settings for it).

This is not a bug, but a feature.

Aug 09, 2008 | Canon EOS 40D Digital Camera

1 Answer

Canon EOS 40D aperature issue


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

Jul 15, 2008 | Canon EOS 40D Digital Camera

1 Answer

Canon 430 EX flash problem


Were you indoors? if so, take the ISO of AUTO and out it on 400. Leave the camera set like you had it, Manual 1/60 @ 5.6. Do notuse evaluative metering. Use single spot metering or the smallest center weight setting.

Jun 28, 2008 | Cameras

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