I have just aquired a Schneider Symar S 135mm F5.6 lens. The lens glass is unmarked and clear, the shutter appears to be reasonably accurate. There is one odd thing about it I've never seen before, and wonder if it can effect its performance. Looking through the front of the lens, the edges of the glass elements appear to have white dots where the glass meets the barrel. This is only on its edge, not the surfaces. As its not in the light path it shouldn't have any effect, but could it have an effect on flare or am I being over concerned?