I have a Canon 1100D and a 50mm f/1.8 lens. Seems like the camera insists on shooting at default aperture, but I won't have it, since that results in a mostly blurred video. How can I adjust the aperture?
Okay, so it turns out that the shutter change is automatic depending on the amount of light available. You cannot alter the shutter manually. What this means in practical terms is that, with room lightning you are 99% guaranteed that you're shooting wide open, which just blurs everything and makes the video mode pretty much unusable. Thanks Canon.
Blurriness is also affected by focus.
Apart from the aperture make sure that you have focused on your subject. (Again read the manual on how to do this)