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Re: how do I change the aperture...
You have to hold down the exposure compensation button at the same time as turning the control dial.
The values appear on the control panel screen.
I found this on page 33 of the manual...
Set the mode dial to M and turn the control dial to set the value.
• To set the shutter speed: Turn the control dial.
To set the aperture value:Turn the control dial while holding down the
[+-](exposure compensation) button.
The exposure level indicator appears on the control panel screen, showing the difference (ranging from -3 EV to +3 EV) between the exposure value calculated by the currently selected aperture
and shutter speed compared to the exposure value considered optimum by the camera.
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The aperture is the opening in the lens through which light passes to the image sensor. Changing the aperture setting allows you to control the depth of fieldof a photograph. When the aperture is opened to a widersetting, (indicated by a lower f-stop number) more light is passed to the imagesensor, creating more shallow depth of field. Closing the aperture (indicatedby a higher f-stop number) allows less light to pass to the image sensor,creating wider depth of field. NOTE:The aperture setting is one of three primary settings usedto control the overall exposure of a photograph. The other two primary settingsare ISO and shutter speed. Because the three settingswork together to produce the overall exposure for a photograph, changingthe aperture setting will require complimentary changes to either the ISO or shutter speed to produce a properly exposed photograph. These changes will bemade automatically by the camera in the Auto, Program, Aperture-priority andShutter-priority modes. There are two ways tocontrol the aperture setting on the camera:
Aperture-priority mode (A)- When shooting in Aperture priority mode (A), you set the aperture value and the camera automatically sets the optimum shutter speed for you.
Manual mode (M)- When shooting in Manual mode (M), you control both aperture and shutter speed, which gives you maximum creative control to achieve the exact results you want.
In aperture mode TA, you only can change the aperture manualy. The camera will try to set everything else, like shutter speed and ISO, according to what the camera thinks is the best. Will look at the scene and focal length. The amount of light should be enough according to you ISO setting.
In manual, M you have to do everything yourself. You can get under or over exposed pictures. When you choose "wrong" settings. But what is wrong? You decide what part of the photo has to be correct, even when the rest is to dark or to light. It could be you did setup the camera to warn you when over or under exposure occurs. I'm not that familiar with the canon DSLRs to be 100% sure, but I would look there.
again, aperture mode is not a manual mode and the camera needs enough light so it can manoeuvre in the settings you made.
Only in the Aperture mode and in Manual mode, you can choose the desired Aperture. It is all in the manual page 53, 54 and 55.
You can change Blurring / sharpening of the background (this most of the time will change the Aperture) you can change the brightness (will change the shutter speed) and you can add some image effects and choose for single shot, continues and self timer.
You can't directly choose for changing A, or S.
If you want the camera to set the shutter speed for proper exposure, turn the mode dial to the A position for Aperture Priority. Press the +/- button to display the shutter speed and aperture. Press cursor-up/down to change the aperture and the camera will change the shutter speed to give the proper exposure.
If you want to set the shutter speed and aperture yourself, turn the mode dial to M for Manual. Press the +/- button. Press cursor-up/down to set the shutter speed, cursor-left/right to set the aperture.
Full details are in the Shooting Mode section of the manual.
If you're using a lens with an aperture ring, simply set the exposure mode to Manual or Aperture priority and change the aperture by turning the aperture ring on the lens. In Aperture priority the camera will set the shutter speed appropriately, in Manual you have to determine the appropriate shutter speed. If you want to use such a lens in Shutter priority or one of the Program modes, you must set the aperture to its smallest setting (largest f/number) and lock it.
If you're using a lens without an aperture ring then it's a bit harder. You can only use the camera in Shutter priority or one of the Program modes. You turn the command dial on the camera to change the exposure, and the aperture will change. If you want to use an exposure different than what the meter suggests, you can adjust it by using either exposure compensation or changing the ISO setting (or both).
If you need a manual, you can download one from http://butkus.org/chinon/nikon/nikon_n6006af/nikon_n6006af.htm
You need to understand the relationship and teractivity of aperture, shutter speed and iso. In Av mod, you choose the aperture and the camera makes thw shutter speed agjustment, In Tv mode, you set the shutter speed and the camera makes the aperture adjustment, In manual, you have to set both shutter speed and aperture manually. If the ISO mode is set to AUTO, the camera chooses the sensors sensitivity to light automatically. Change to specific ISO (200-400 for daylight and 799-1600 for night). Take a picture in AV mode and note what shutter speed the camera chose. Then switch to TC mode choose the same shutter speed and see if camera chose the same aperture(f-stop) you chose in first shot. Change to Manual and choose same f-stop and shutter speed the camera chose for you in the other modes. Compare all three photos. They should be almost if not exactly the same exposure wise. In Tv mode choose a dlowers shutter speed, In Manual choose a combo of slower shuuter and wider f-stop(smaller number). Read your manual.
Turn the mode dial to "A". Turn the jog dial to change the aperture and the camera will change the shutter speed to match. You can also go to the manual mode, where you have to set both the aperture and shutter speed. Full details are in the "How to use the APERTURE PRIORITY mode" section of the manual (page 22 in my copy). If you need a copy of the manual, you may download one here.
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.