I just received my SF501b 1.5--1.8W laser from Scifi lasers and now the focusing ring came off and when I put it back on, the only light that comes out is similar to a flashlight. I only had it for 6 days and now it's not shining like a laser anymore.
FWIW, that focusing ring needs to be made so that it doesn't accidently come off. I don't believe I turned it excessively. If there was a lens in it, I can't find it anywhere and I know exactly where I was standing in my house when it came off. I do remember I was aiming it at a wall and trying to focus it when I noticed that the knob was loose. Suddenly it came off. I guess this thing wasn't made as well as I gave it credit for.
FWIW, that focusing ring needs to be made so that it doesn't accidently come off. I don't believe I turned it excessively. If there was a lens in it, I can't find it anywhere and I know exactly where I was standing in my house when it came off. I do remember I was aiming it at a wall and trying to focus it when I noticed that the knob was loose. Suddenly it came off. I guess this thing wasn't made as well as I gave it credit for.