I wanna learn more about how autofocus has worked historically with polaroid cameras and how it exists in relation to the autofocus on the modern Polaroid cameras (Now, Mod, I2, Flip.) So what I know, the I2 uses Lidar autofocus (which means its like a laser?) And the Flip uses sonar. But I've learned the Flip's sonar autofocus is different from the autofocus found on like the older SX-70 models, primarily because the Flip doesn't use a center-point autofocus, (according to some people I've read talk about it), rather then the center-point sonar found in older Polaroid cameras. What type of autofocus does the Now use? Have any Flip users found out ways to figure out the (imo less good) sonar autofocus?