The Filters We Need With Digital...

Started Oct 5, 2008 | Discussions thread
DaSigmaGuy Forum Pro • Posts: 12,304
Re: The “Non-Filter” You Need, and the Filter You Don’t

Joseph S Wisniewski wrote:

The Protection Racket

Well, what about the “protection” filter: be it the traditional “UV”
or “haze” filter, or a so-called “digital” filter? The camera store
salesman told you that you need one. He may even have said you won’t
get a warranty if you don’t have one (a lie the smarmiest sales
people have been using for decades).

Funny you should bring up this subject Joe. I have just bought a Tamron SP 300mm f2.8 LD IF and while searching for sites with more info about it I came across a lens test with a remarkable finding...As you probably know, Tamron used to offer an optional 112mm "normal" filter for the front of the lens. I dont know what a "normal" filter is but apparently the tester has found his Tamron 300/2.8 to be considerably sharper with this filter on the lens than without it!!!

He has even posted MTF graphs to show the difference, with and without the 112mm normal filter.

If you have time, perhaps you would like to read his article to try and work out whats going on. After reading it I now feel perhaps I should try to get one of these filters or my lens wont be as sharp as without one.
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