I have a MK4 3.5-10 and on the low power wetting the image is a little fisheyed around the edges, I dont know if "fisheyed" is the correct word, but it looks like the edges are at a different magnification than the center. It dissapears after 4x. I have a VX-III just like it and I dont notice it on that one. Is this an issue that can be fixed or just leave it above 4x and dont worry?