In reply to Christian's question: Sover wrote: "I use a Hoya 95mm linear polariser with my Nikkor 50-300/f4.5 ED, and I had no problems at all. ......." Sover [and Christian who asked the question], I think that [for the Nikon 300mm f/4 EDIF lens], the most affordable and easiest to use Polarizer is the 39mm drop-in filter. The Nikon 39mm drop-in filter comes with a geared wheel which makes the polarizer very easy to use. Sincerely - Anil [from Bangladesh] 1/14/1999