I use shutter speed this way, If my focal length is say 45mm then I use a shutter speed of 1/100s or as near as I can get it. If the aperture does not give you enough light then alter your ISO until it looks right. You need twice the shutter speed for the focal length you are using. A word of caution. Even though you can sometimes get away with it, if you use a slow shutter speed then use a tripod.
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