Question about Canon EOS Rebel XSi Digital Camera

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I am having trouble with aperture . On AV or manual mode The aperture will not go past F-25 or sometimes F-29 etc. Yesterday I was able to set the F-stop to F-32 and even F-40. There was no restriction stopping me from accessing higher or lower F #s. Today for instance I am on the M setting ,yet the largest aperture # I can attain is F-29. The camera is new to me and I have been playing with settings. I have reverted to the Default settings with no luck. There is hopefully something simple I am missing. Any help and suggestions are greatly appreciated. charlie

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  • koinz Oct 13, 2010

    lens.Cannon EFS 18-55 mm And Cannon 75-300mm. Ok think I am beginning to catch on. I just tried both lens and get diff. F stop abilities with each. However I have already taken a picture yesterday with an apperture of F-36, using the 75-300mm. Just by turning the dial in Manual mode. Right now I am unable to xceed F-32.This is while focused on the same scene. something simple here I must be missing. Also for a while on the 18-55mm I was only able to stop at F-25. Somehow top stop is F-29 on same lens, can't figure out what I am doing differently. Thank charlie

  • koinz Oct 13, 2010

    Thank you for helping me gain a better understanding. Helpfull and worth the 6 bucks.New to digital photography. .Old dog used to 35mm. Charlie

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Are you using a zoom lens? If so, which one?

Many zoom lenses have variable maximum apertures. This means that the maximum aperture changes according to the current focal length. This also affects the minimum aperture. Thus the lens may not stop down as far at shorter focal lengths as it will at longer lengths.

Posted on Oct 13, 2010

  • kakima Oct 13, 2010

    The 18-55 has a minimum aperture ranging from f/22 to f/38 depending on the focal length. The 75-300 has a minimum aperture ranging from f/35 to f/45.

    Take a look at the EXIF data of the photo you took yesterday to see what focal length you used, then use the same length with the same length. You should be able to get the same aperture again.

    One thing you might want to check is the aperture stop increment setting on the camera body. This could make a difference of a third of a stop or so at either end.

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Not knowing your experience level, I want to make sure that you are (in the Manual mode) attempting to change the aperture by holding the aperture button with your thumb while rotating the main dial to increase or decrease the aperture value. If you are doing this, and the aperture value isn't changing, the camera needs service. You are probably still under warranty, so this should not cost you anything.

If you're in the USA, you can set up the repair service yourself at this link.

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Manual mode


I presume that when you select Manual Mode you are then selecting a suitable aperture and speed and ISO to give you a correct exposure? If you are then I guess this is a problem for Canon to sort out.
Sorry if I'm teaching you to **** eggs - trouble is on a site like this we have no idea of the skills of the operator - you may be a novice - but I suspect you know how to go about it and have no need for this obvious response - anyway, good luck!!
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See pages 36&37 of the manual.

If you haven't got one, you can download it here.

In M mode...

Turn the selector dial to adjust shutter speed.

Hold down the AV+/- button (top-right of rear screen) and turn selector dial to adjust aperture setting.

As for Av mode, this is perfectly normal that you cannot set the shutter speed. Av mode means that you decide on the aperture setting and the camera (not you!) decides on the correct shutter speed.

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