I for one find no reason to try the vx-l.Instead of going to a larger lens to increase brightness,I prefer going to a scope with better lenses andcoatings.I find my swarovski 3x10x42 scopes every bit as bright as the vxIII 3.5x10x50.As well the vxIII 3.5x10x50 actually has more lens surface area than the 50mmvx-l,so the 50mm vx-l will not likelybe as bright as as the vxIII.