The official bootloader unlock of the new Xperia Z3 and Xperia Z3 Compact is making a hell of the camera. This very difficulty occurred in Xperia Z1 and this time both Z3 and Z3 Compact falls prey of this situation. The official bootloader unlock is literally degrading the camera functionalities of these high end Sony smartphones. Unlocking the official bootloader is breaking the camera functionality severely resulting in poor camera performance.
Sony was contacted to clarify the problem. When the bootloader is unlocked the phone loses DRM keys. The Sony representative contacted agreed to the allegation and said that when the official bootloader is unlocked, the user cannot purchase from Storefronts. Besides this, some of the licensed features will not work and most importantly some advanced camera algorithms of the camera which are protected by DRM stops working. Thus unlocking the bootloader will make the camera picture quality hazy and noisy in lowlight.
…the removal of DRM security keys may affect advanced camera functionality. For example, noise reduction algorithms might be removed, and performance when taking photos in low-light conditions might be affected.
Source: Android Police