Microsoft releases Lumia Camera Beta for Windows Phone, but only those with select Lumia smartphones are able to download the app.
It is available for Lumia 930, Lumia Icon, Lumia 1520, Lumia 640 and Lumia 640 XL and requires the Lumia Denim update. The first Lumia Camera Beta release (v188.8.131.52) includes:
Exclusively for Lumia
– Access to Office lens from settings menu
– Pro settings remembered after restarting the app
– General performance improvements and bug fixes