Only Tv mode?
Whilst Tv mode may seem the obvious choice – as it allows you primarily to take control over the shutter speed – there are other ways to work, of course.
• Manual mode – you are in control of all of the settings, including the shutter speed. This mode can work well, so long as your conditions are consistent.
• Fv mode – this new kid on the block is a versatile mode, once you’ve got to grips with it. You can take control over whichever of the exposure settings you want, or let the camera sort them out. So you can use it like Manual mode, or Tv mode, or Av mode, or even hand over full automation to the camera. And you can do all of this without changing mode (hence its name, Flexible priority).
• Av mode – this may seem less than obvious, as this mode allows you to set the aperature, and the camera remains in control of the shutter speed. Surely the whole point is that you want to be in control of the shutter speed?
However, when Av mode is used in conjunction with the ISO speed setting options (selected EOS cameras), this can be a powerful combination. You can specify an minimum shutter speed from which the camera can choose.
How to set a minimum shutter speed