For anyone sick of the camera lag or HDR being finicky,ive been using the Moto-X Camera APK that I originally came across when I had my S4 (worked perfect on that phone). Tried it on my N5 and works great so far, been using for the last 24 hours without issue.
Link --> http://xdaforums.com/showthread.php?p=44009561
-Vodka
Link --> http://xdaforums.com/showthread.php?p=44009561
-Vodka