Stumped. Cutting issues

[Stroonzo (Jeff)]

@jayeleitch

Does the lens itself go flat side up or flat side down

This will explain. Also reading through this thread will give you additional information regarding focal lengths:

4” lens issues. Will not cut though material

Check the orientation of the lens and be sure the outward curved side (convex) is facing up. [image]

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@jayeleitch

are there better lens to uprade to

My suggestion here:

What is the best kind of focusing lens

II-VI Infrared lenses are superior. Meniscus lenses are what I recommend. “Meniscus lenses are designed to minimize spherical aberration producing a minimum focal spot size for incoming collimated light.” http://iiviinfrared.com/CO2-Laser-Optics/meniscus-lenses.html [image]