I have recently started uni and have been asked to take the same shot 7 times at different apperture settings I was completely fine with this but i can't correlate the f numbers to the settings on the camera,
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Re: Changing the aperture on my 350d
To set you aperture only press AV button with one finger and then turn the control situated next to shutter release button at the same time . ( your camera should of course be set to M with the main control knob ).
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If the screen is saying "FEE" and not "f/33" then you need to set the aperture ring to its smallest setting (largest f/number). You control the aperture from the camera, the same as on a lens without an aperture ring.
Since there is no shutter or aperture priority mode on the A550, the shutter speed is predetermined by the shooting mode. You can try changing the ISO speed when in a certain mode, but the camera may compensate by changing the aperture setting rather than the shutter speed. You'll have to experiment.
You can place the camera in Long Shutter Mode, however, when you want exposures times between 1 and 15 seconds. You set that by pressing the Function menu and Func. Set button when in [Camera icon]M mode, then using the < and > buttons to cycle through the long shutter settings.
You need to "lock" the lens at the smallest aperature. With the lens removed from the camera, rotate the ring to the smallest aperture, which is the largest number (like 16 or 22). Next to that number you will see a small slide switch. Move that switch. It loocks that ring at that setting.
First of all, shooting sports in manual is about the most difficult thing you could ever choose to do. I use the Av (Aperture Priority) and let the camera set the shutter speed. Just set your aperture wide open and fire away. That way, you're not constantly fighting with settings missing great shots. Also, in manual, BULB is simply one of the settings and can't be turned off. It can only be 'not selected'.
Action shots generally require a fast shutter speed -- to freeze the motion. So you need plenty of light or a "fast" lens. A fast lens is one in which the aperture opens further to let in more of light. The smaller the number of the maximum aperture, the faster the lens, so a 28-105mm f/3.5-4.5 lens is "faster" than a 28-105mm f/4.0-5.6 lens. But usually, faster lenses cost more.
For the settings on the camera, the Rebel K2 has a Sports image mode (silhouette of a runner) on the control dial which should get you appropriate settings for most action shots.
If you want to set the shutter speed yourself use the Tv mode, and with a fixed shutter speed, the camera will set the correct aperture. Watch in the viewfinder -- if the aperture value is flashing, it means the shot will be underexposed. You will have to select a slower shutter speed.
Another way to get action shots with limited light or a "slower" lens is to use film with higher ISO/ASA. ISO 100 film is good for daylight shots, but for inside shots or evening shots, use ISO 400 film. Higher ISO film is "grainier", so enlargements will show less detail.
The W1 uses metal rings that slide in place with a tiny hole in the middle to give the required apperture it does not have a diaphram that closes and opens to give the apperture... so what you here is the sound of changing the suitable ring ( or disc) with the apperture ... You can look in the camera (lens side) and change appertures, you should be able to see this happen ... don't click with flash though :)
The sound is very low though if you here a loud click there's something wrong.