It is an interesting mod to “maximize potential of Camera” on Lumia devices running Windows 10 Mobile. Modders over XDA Forum have succeeded in altering the parameter values of Camera on a Lumia 730.
The mod gave Lumia 730 capability to shoot at ISO 50 and with 4 Sec shutter speed, normally only achievable on PureView devices. Above good looking image is result of custom settings.
Step by step instructions to do the mod is listed below. Do it at your own risk and if you know what you are doing.