Can The Field Angle Of A Source Four Be Changed By Moving The Lenses Inside The Tube?

Question:

I took apart my Source Four lens tube for cleaning and I noticed that there are positions cast in the tube for each of the field angles. Can I change the field angle of my fixture by simply moving my existing lens to a new position?

Answer:

No!

Each field angle uses a specific lens. The lenses are different sizes and each lens has a colored dot on it's edge to identify its placement.  The following is a cutout from
the Source Four assembly guide manual.