Hi, just bought a new 70-300mm lens with UV filter. During night photography, for example, if I focus a strong spot of light in the center of my lens, I noticed a flare near to it. When I removed the UV filter, it is clear from my viewfinder. It couldn't be dust, dirt on the lens and filter as I checked and cleaned both the filter and front element thouroughly. Thus I can only conclude that UV filter causes the lens flare. Am I right?