OK, so I just bought a Vortex SPARC red dot today, and am really liking it. But it's my first red dot, so I have a question about the dot itself. How crisp is it supposed to be? The dot has a bit of a star-burst effect, which goes from moderate at low brightness to extreme at high brightness, making the dot not really look like a circle. It is still totally usable, but I just want to know if it is normal. I tried to take a picture, but my camera wouldn't focus correctly. I have uncorrected 20/20 vision, and had the dot looked at by two other people who agreed with me. Any input?