I gather that the Lee ND grad orientation is done by moving the holder with respect to the adapter ring, pull spring clip out, turn, release spring clip? Or does the adapter ring rotate with respect to the lens? Why not put the adapter on the polarizer rather than deal with a loose front clip-on polarizer? Attach adapter ring to polarizer, adjust polarizer, then clip on the holder and grad ND? I already have 49mm and 52mm polarizers with front threads for my Sigma DP#Merrills , I'd prefer not buying an expensive extra polarizer.