I am looking at buying a polarizing filter to put on my Nikon 18-70mm lens and to use with my D50. I have looked around and read recommendations for a Nikon C-PL II, which I can't find anywhere. I have also read good things about the Hoya Pro filters. The Hoya Super HMC glass through B&H is nearly $160. I have seen other polarizers from Tiffen for about $40. Now I know you get what you pay for, and I am sure the Hoya filters are top notch, but when (i.e. under what shooting conditions) will their filters be worth the extra $120? If it is just a matter of keeping the sun out of the frame to avoid ghosts or flares, than I might choose to save the extra money. Besides, I am also buying the Nikon 50mm 1.8d. If the cheaper filters are "good enough," than I can probably get one for each the 50mm and the 18-70mm. It's too bad these two lenses don't use the same size filters.