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I was looking at the g2/1 lens and also the 3 element glass lens for my first high power laser with the mtype m140 laser. Should I go with the g1/2 or the 3 element?

Hey, newbie here. Just opened up my first m140 projector. I have a few mtype and atype m140's I've heard people talking about how atype a140s are true 455 while the a and mtype m140s are 450. Is there any real difference and is it noticeable? How do the wave lengths compare between the a and m...