Originally posted by matsui255 Thanks! Is it possible to change the Shutter speed in Pmode or can this only be done in SV mode??
Sv mode means you select the sensitivity (ISO) of the sensor, the camera will adjust shutter speed and aperture for proper exposure. If you're in a dark room and choose 100, there won't be enough light, so you would have to choose 800, 1600, etc.
I suggest you do the following:
Turn auto ISO off. Set ISO to 400. Go outside. Set to Av mode (aperture priority mode). Set aperture to 5.6.
Camera will now ONLY adjust your shutter speed for proper exposure. Look at the shutter speed the camera picked for you as you aim at a scene or subject, and notice how it changes when you point to different things of varying darkness/lightness.
Now, set your aperture to 8.
See the difference?
Keeping your ISO FIXED to start (not auto) and playing in Av mode will better teach you how the various elements affect proper exposure. When you run into a shot you can't do at 400ISO, you'll know to increase its speed.
So I take back what I said above. I still hate auto ISO.