The filter I got was very inexpensive,(8$) It seems weird to me to have a really good quality lens and then cover it with plastic(?) or inexpensive glass, You would think something would happen in the translation, Thanks for the feedback and for the link. I just found the box that the filter came in. Its the Stiffen uv protector,I just read the back and these filters won technical achievement awards and a scientific award from the academy of motion picture arts and science,,,,an Emmy for engineering excellence, I kinda think I will stay with it, I shoot a lot on the beach and noticed I had water spots on some of the photos I took that I was able to eliminate with the retouch tool in my editing software,The problem may be more pervasive without a filter. I kinda think that the overall potential for damage and dust is greater than the potential for image reduction?! Also, the lens is somewhat large and may be vulnerable to scrapes and scratches,