I was hoping that those who own the PanaLeica 15mm could do me a favor and answer a question for me. I'm curious if the supplied lens hood will still attach to the lens when a CPL filter is fitted to the lens? The reason I ask is because I currently own an Olympus 17mm f/1.8 with the Olympus lens hood that attaches via compression ring when tightening the thumb screw, and recently purchased a B+W CPL filter. The problem is that once the filter is attached to the lens, the lens hood won't fit over the knurled portion of the filter, meaning that I can't attach the lens hood when using the CPL filter. In the image below, you can see the portion of the filter I'm talking about, the "ridged" portion under "Made in Germany". The lens hood for the 17mm won't fit over that. I'm curious to know if anyone owns a 15mm and a CPL filter, and would be willing to see if the lens hood for the 15mm will still fit on the lens when a CPL filter is attached (any CPL filter should do, since all of the ones I've seen have had this knurled feature to assist in tightening the filter to the lens threads). Thank you for your help, it's greatly appreciated!