The auto focus is setup for a 50.8mm focal lens from factory. 
To change lenses, auto focus height does NOT need to be adjusted.
You'll notice the lens holder has an upper and lower installation location.
The 50.8mm lens is installed in the top of the lens holder, the 38.1mm focal lens is installed in the bottom location of the lens holder.
A 101.6mm focal lens is installed at the left opening of the laser head. Please remember only 1 lens should be installed at a time. See photo for clarity.
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