12-19-2011, 06:39 AM
If you don't want to let go of your mouse, alternatively you can simply press the Alt (Option) key and scroll up and down with the scroll wheel on your mouse.
To make sure that you get even zoom ratios, such as 25%, 50%, 100%, 200%, etc you should keep the Shift pressed as well.
To make sure that you get even zoom ratios, such as 25%, 50%, 100%, 200%, etc you should keep the Shift pressed as well.