Guys has anyone tried using lenses with 50 mm focal length? Does it have to be exactly 45 mm? I measured the distance from the lens area to the screen of the ph

Guys has anyone tried using lenses with 50 mm focal length? Does it have to be exactly 45 mm? I measured the distance from the lens area to the screen of the phone and it is 46mm. I was thinking of using 50 mm lenses. Any ideas? Thanks