Use iPod touch camera tools to set up your shot
Before taking a photo, you can use Camera 
tools to customize and improve your shot. Turn the flash on or off, set a timer, adjust your camera’s focus and exposure, straighten your shots with a grid, or add a filter.
Adjust the camera’s focus and exposure
Before you take a photo, the iPod touch camera automatically sets the focus and exposure, and face detection balances the exposure across many faces. If you want to manually adjust the focus and exposure, do the following:
Open Camera.
Tap the screen to show the automatic focus area and exposure setting.
Tap where you want to move the focus area.
Next to the focus area, drag
up or down to adjust the exposure.To lock your manual focus and exposure settings for upcoming shots, touch and hold the focus area until you see AE/AF Lock; tap the screen to unlock settings.
Turn the flash on or off
Your iPod touch camera is set to automatically use the flash when needed. To manually control the flash before you take a photo, tap 
, then choose Auto, On, or Off.
Take a photo with a filter
Use a filter to give your photo a color effect.
Open Camera, choose Photo or Square mode, then tap
.Below the viewer, swipe the filters left or right to preview them; tap one to apply it.
You can remove or change a photo’s filter in Photos. See Revert an edited photo.
Use the timer
You can set a timer on your iPod touch camera to give yourself time to get in the shot.
Open Camera, then tap
.Choose 3s or 10s, then tap the Shutter button to start the timer.
Use a grid to straighten your shot
To display a grid on the camera screen that can help you straighten and compose your shot, go to Settings 
> Camera, then turn on Grid.
After you take a photo, you can use the editing tools in the Photos app to further align shots and adjust horizontal and vertical perspective. See Straighten and adjust perspective.