This product is 100% compatible with the HDR-CX900 camcorder from Sony, you can even put dessu by this lens, the sun visor! The lens was received without any scratches.
As for the polarizing filter, this premium filter is very useful to protect the lens at a reasonable price and without impairment of quality of the image. A very good product.
Very good filter, fine, perfectly protects the lens and especially easy to maintain (unlike the Tamron I had before, where it was impossible to recover fingerprints).