Laser focal length?

I’m making go/no-go gauges for the laser z on both lasers, but I don’t recall the new focal length. Anybody remember? On a related note the small laser is working well except for circles, which don’t cut well for some reason. Working on it.

The big laser is currently loaded with focal length = 127 mm +/- what 5%?
the small laser is 38.1 mm +/- something or other unknown. (one new spare of each too)

In the cabinet, we have two new 50.8 mm lenses which will fit either laser.