I have taken an excellent online course in iPhone photography citation target title iPhone Photography School | iPhoneography Tips & Tutorials index 1 unique_id oKCvL and they have a private Facebook group. I recently made a list of all the different apps folks have used to produce amazing and learn the ways to control focus and exposure with either your native camera app or one like Camera +. The course I mention covers all this and lots more. Here are the apps that folks who are really into this are using. The asterisk indicates ones that are used the most (in my unscientific survey of a small population). For my FB group I included prices so Ive left them hereI don guarantee their accuracy ACDSee Pro - free or $ Aviary - freen * Camera+ - $ - super app for taking photos - set focus exposure white balance shutter speed etcn Color Pop - mask an n Photo Toaster - $ * Photoshop Express - freen Photoshop Fix - freen Photo FXnPicTapGo - $ Prisma - free - apply art filters to photosn ProCamera - $ (camera app that has many options)n* SKRWT - $.99 - great for fixing distortions in architecturen SlowShutter - emulates long exposures by taking multiple images and digitallybining them n* Snapseed - free - THE most used app on the group.n Tadaa - freen Tangled FX - $* Touch ReTouch - $ - remove unwanted items like power lines easilyn Typorama - free$. Cool stuff and also watermarksn Vivid HDR $* VSCO - i think it free with lots of in-app purchases