iOS 11 offers multiple camera filter options  that help to take more professional and cool looking photos. It offers 3 basic filters with variations - vivid, Dramatic and Mono. You can apply them when you take a photo or while editing an existing one. 

It's fun to experiment with these modes and get enjoyable experience with your photos. With vivid mode, color and saturation can be increased and make the colors stronger. Dramatic and monochrome variations allow controlling the light and adding professional touch to the pcitures. 

In iOS 11, iPhone Camera filter is defaulted to 'Original'. If you would have changed this to one of the other available options, it will stay until you exit out. After closing and reopen the camera it will be back to 'Original' filter. If you want keep a certain filter capture option for a while, this behavior could be frustrating. Now manually changed filter setting can be preserved by turning on the filter option at Settings -> Camera -> Preserve Settings -> Filter.

If the Camera Mode is turned off in iPhone, it always defaults to the factory Photo mode after you use camera for an activity like recording a video. Instead of leaving in the video mode on after exiting the camera, it would switch back to photo mode. 

By turning on the Camera Mode, now you can preserve the last shot mode in the camera. Go to Settings → Camera → Preserve Settings to turn on the Camera Mode. 

 In iOS there is a section for the information about Battery Health is available under battery Settings. This section shows the estimated battery capacity and shows if the battery can offer peak performance. It'll also show if your device is being throttled due to a reduced battery performance.

 
Maximum Capacity is the measure of battery capacity compare to when it was new. Generally for brand new devices this should show as 100% capacity and reduces gradually over a period depending on the age of battery. Peak performance capability indicates if your device's battery currently supports the normal peak performance or not. As your battery starts to degrade, there will be an option to toggle the Peak Performance Capability on or off. 

 It is good information to know how efficient your iPhone battery is. iOS offers a feature to get this information. Go to Settings - > Battery and scroll all the way down. You'll find the usage time of battery since last full charge and the standby time. Using this with the combination of app specific battery usage will help tweaking the use of apps and extent the battery life after every full recharge. 

If you are surprised to notice your iPhone or iPad battery drains faster, then it's a god idea to check which apps use the most battery. This will also help to identify those apps and close them if not used. Go to Settings -> Battery -> Battery usage to see the breakdown by app. You can see the list for last 24 hours or last 7 days. By tapping any app also will show how long the apps were used.

If you would have turned on the low power mode in iPhone, it will temporarily reduce power consumption. This will be active until the iPhone is fully charged. You can enable this at Settings -> Battery. When the low power mode is on few functionalities such as main fetch, app refresh in the background, Hey Siri, auto downloads, and few visual effects are either reduced or completely turned off. This will help to extent the battery if you can't charge immediately.

Apple recently released iOS 11.4.1 that includes few bug fixes and improved security for your iPhone or iPad. One of the key update  is fixing an issue that prevented some users from viewing the last known location of their AirPods in Find My iPhone.  Also Improves reliability of syncing mail, contacts and notes with Exchange accounts.