Today, I finally got all the parts I ordered to make a doubler for the x-sight 3x. I used a 43.5mm-52mm step-up ring, a 52mm-58mm step-up ring, and a 58mm 2.2x Vivitar Telephoto Converter. I know I only need a 52mm TC to do it. But I thought since I have Canon 58mm lens, if the experiment failed, I can try it on my camera.
It works! At beginning, I am worried about maybe I need some spacer for it to properly focus. But since the 3x has such a huge range of focus, it merely just increase the absurd 2 feet minimum focus distance to 2 yards. The other disappointment is that the TC is not truly 2.2x, it's only about 1.5x. So now my 3x is a 4.5x. The whole add-on is just about 5 oz. and under $30.
Next, I ordered a 52mm TC to see if it will make it even lighter.