Just curious, does anyone use the pupil guides that come with some of the Naglers and Radians. I have them installed on my T4 Naglers but was wondering if they cut some of the fov out or if there could be any other problems. I thought that they are a good idea for guiding your eye and they seem like they will help keep some grubby fingers off the lens. I was just wondering if there was a cost for using them.