Why is my HTC Desire 820 Rear 13 MP Camera Resolution setting only up to 8 MP?

[AC Question]

HTC Desire 820 Rear 13 MP Camera Resolution Setting only up to 8 MP

My HTC Desire 820G+ rear camera is supposed to have 13 MP. But in the rear camera settings I can only select up to 8MP.

Has anyone come across this? Is the rear camera still taking images with 13MP resolution, when I select the max 8MP setting?

 

[Lucas Marshal 92]

Go to camera setting, in image change the preview size to standard. Then u can see 13 mp option