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Re: Next question - which mode for holiday snaps and underwater?
P vs Auto mode
Auto mode is designed for casual use, such as when picking up someone else's camera and you don't know what unusual settings they may have. Auto just forces all settings to their defaults for most "hidden" settings - on the quick menu only some options will be enabled and these should be easy to see quickly.
P is a program mode and allows you to set any camera options, and they'll be remembered next time.
Note: On this camera Auto uses i-Enhance picture mode whereas P lets you choose your picture mode (including i-Enhance), but defaults to the Natural picture mode. So out of the box, Auto mode pictures are going to have brighter colours. The i-Enhance picture mode on Auto is arguably too saturated and disappointingly this reduces the usefulness of Auto mode at least for me.
I set my own "quick use" mode by setting all my options in P or A mode to what I want, then saving that into a custom mode - C1 or C2. Thus you get the benefit of having every setting how you want it, but also if you make any changes to settings while shooting the changes are thrown away next time you turn the camera on or go back to your C1 or C2 mode, so you can depend on them being set to what you want.
Underwater mode
You can use whichever mode you like underwater - you don't need to use an underwater scene mode. A skilled photographer may choose to just use A or P and shoot RAW to apply their own colour corrections later.
There are some unique challenges when shooting underwater that the underwater modes attempt to automate for you. Firstly, the colours will be tinted and washed out, so all the underwater modes set the colour balance to try and correct this.
The "underwater snapshot" basically just does this - it's a normal camera mode but it puts the picture mode on "vivid" and adjusts the white balance to compensate for the colour tint.
In deeper water autofocus can be difficult due to low light. The "underwater wide" mode disposes with autofocus altogether. It does this by narrowing the aperture and focusing to a moderate distance where most things will be in focus (technically, I think it's a little closer than "hyperfocal"). This will eliminate focus hunting but anything closer than 2 or 3 feet to the camera *will* be out of focus.
All the above can still be done in P or A mode instead using settings such as picture mode, white balance, and more - remember the camera supports choosing aperture and focusing manually so you can even replicate the underwater wide mode. It's just that the underwater modes attempt to make this much quicker.
The other underwater modes are more specialised and hopefully you can figure out their purpose.