@KenCitron looks like I was a bit previous in suggesting the lens is glued in place - it looks like it’s fixed in place by brass plates.
@CraigBroady - how can you say the beam is collimated? I don’t believe it’s a simple thing to do with a single lens? moreover how do you explain my photos showing beam profile convergence and then divergence?
Form1+ laser flare issues illustrated - pics and video
A collimated beam is parallel light - although obviously not perfectly to infinity in the real world, but ignorant as I am optics, I don’t imagine that light that converges to a point 30 cm from the laser barrel and then diverges can be called collimated.
here’s some pics showing the lens inside the F1+ laser.
