Machine settings - focus distance

Hello I’m wondering if anyone can help with my autofocus feature. I have noticed in the machine settings that there is a value of 7.9 in the Focus distance field. This was the default when I received my Boss Laser LS1630.
The 1630 came with a 2 inch lens. Since then I bought 4 additional lenses from American Phtotonics, 1.5”, 2”, 2.5”, and a 4”. Can you tell me what the values would be for this field for each focal distance?

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