Filters & such
I use the Quantaray multicoated filters (& it's buy 2 get one free at Wolf/Ritz right now) and can not tell the difference in them or Tiffen.
Also, I believe that most neutral density filters are half & half (or maybe they are called gradient neutral density). As in, one half is neutral density & the other is clear. Great for shooting landscapes if the sky is white/hazy & your zoom doesn't turn your lens.