How to return to camera when looking at Albums?
You are correct. This is because it is switching from the Camera app to the Photos app. People have been a little annoyed with this for a long time, but I suppose the separation is logical. 

To get back to the camera you can either:


Double tap the home button and swipe from right to left and then tap the camera app, or
Swipe up from the bottom of the screen and tap the camera icon in the Control Center.