Ken did a little (but, very good) test comparing both UV filter and Polarizer filter from Hoya S-HMC and Tiffen. The purpose of this test is to answer questions such as “UV filter to protect lens?”, “Should I get a multicoated filter?”, and “Which polarizer should I buy?”.
Canon 70-200mm F/4 without UV filter and with Tiffen UV filter:
In conclusion he wrote:
“Uncoated filters are really bad and drastically reduce contrast. Multicoated filters are *very* close to no filter at all. And yes, you really do need multicoated polarizers.”
Go to UV and Polarizer Filter Test @ Ken & Christine’s Gallery