Moto G 2013 does not have a gyroscope that is required for 'photosphere' to work.
The Moto camera app has a 'panorama' feature that takes a 180° pan shot, but you have to move it in a sweeping motion.
The Moto camera app is better than the stock Google camera app and 'Camera Awesome' that comes on the Nvidia Shield tablet.
It allows saving pics to the SD card and does 'drag spot to focus and exposure' way better than others.
The 4G model seems to be the only model with a gyro, but the default camera app doesn't do photospheres.
I downloaded and installed the google gallery/camera apk, and have a sphere option in its camera settings.
Yeah, I'm not sure why the Moto G 4G model has a Gscope, but the original G doesn't.
Without the photosphere feature, there's no reason for me to use anything but the Moto camera app on my Moto G 2013 WiFi model.
The moto app does auto focus/ exposure better than the Google app, and at least I can do a 180° pics.
On my Nvidia Shield tablet, I can use photosphere because it has a Gscope, but it won't save to the SD card.