Very basic, laser cutting 101-level question: If a lens's focal length is 50.8mm (2"),

Lasers
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1

Very basic, laser cutting 101-level question:

If a lens’s focal length is 50.8mm (2"), does that mean that, for cutting, the middle of your material must be 50.8mm away from the lens for an optimal cut?

2

This may help explain it… But yes focus to the middle of the material for the best cut

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3

Thanks! That does help.

4

Depends. Typically yes. But for acrylic where I want to smooth a low power cut (score) or an engrave I often de-focus the laser. For most things there’s no real difference top vs middle focus too - especially with 1/8" material.