12mm size, 50.8mm focal length. (default K40 lens size)
Germanium material, Excellent optical index for our machine and has higher refraction index, meaning the kerf, the leaning cut is smaller with GE-lenses.
This lens should only be used in maximum 40w laser systems due to thermal runaway risks with the GE-lenses.
Please, measure the old lens or lens holder before ordering!
Standard focal length for K40 is 50.8mm