iRAW

iRAW is a camera app that supports manual and automatic modes and uses the RAW photo capability of your newer-model iPhone. 

All photos are stored in DNG (digital negative) RAW format, which if correctly processed can result in very nice photographs.

RAW photos require about 15 MB per photo, as they are stored in DNG format.

iRAW lets you use Airdrop to copy photos to your Mac and you can email photos as email attachments.

In manual mode, iRAW provides sliders to control shutter speed and ISO. There is an optional 2-second delay before taking a photo.

There is a live histogram to help you take better photos and optional grid lines.