Polarizer absorbtion

[Daos]

I read on the bhphotovideo site something like this:

CANON 58mm Haze UV-1 Glass Filter
Ultraviolet filters allow you to correct for the UV effect to varying degrees. Haze-1 filters absorb approximately 71 percent of UV.
(same for TIFFEN 58mm UV Haze-1 Glass Filter)

TIFFEN 58mm UV Haze-2A Glass Filter
The Haze-2A filter is best when shooting at higher altitudes where UV light is more prevalent and greater UV absorption necessary. Haze-2A absorb nearly all UV light present.

BUT for HOYA 58mm Haze UV(0) (HMC) there is not stated what % of UV is absorbed. Or UV(0) means that their is 0% UV absorbtion?

Which one is better?
What's the difference when taking photos between Canon UV-1 and HOYA UV(0) and in what conditions should they be used?

Thank you! Sorry for posting so many newbie questions...

[Daos]

Tomorrow it's gonna be my final decision day and I would really appreciate any help/advice you can give me.

[12345Michael54321]

In degree of absorption of UV light under 400mu wavelengths -- the industry standard, except that Nikon is said to sometimes take 370mu as its cut-off -- first are the UV filters (which are clear), with "basic" reduction that varies widely across brands; then the Skylight (about 50%, and sporting a nifty pink cast); then Haze 1 (about 70%), then Haze 2 (up to about 99.7%).

Take these figures with a grain of salt. A manufacturer may claim, "This filter reduces UV haze by 89.218%." But you know what? In reality, it could be 75%, or 99%, or something else. Sorry if it disillusions you to hear this, but advertising hype does sometimes play fast and loose with numbers, particularly in something like this, where very few consumers will be testing the filters for themselves and getting detailed numerical results.

Personally, I'd suggest choosing filters based on factors like coating/multi-coating/fully multi-coating/etc., materials - brass vs. aluminum vs. plastic, maybe on quality of glass (for example, B+W and Heliopan use Schott glass, which has a great reputation) and price, rather than on whether a Hoya might absorb slightly more UV than will a Tiffen.

Any of the above will serve as a de facto clear lens cap, which is how most people use them. And any of them will cut down on UV haze (not visible haze, mind you).

BTW, a polarizer absorbs UV light, too. So when using a polarizer, don't bother stacking a UV filter with it.

[Daos]

Sorry for the title of this thread... I was thinking about UV filters absorbtion all the time... only now after so many hours I realised what I wrote in the topic name. Sorry again.