There are plenty of discussions online about using protectors and UV (Ultra Violet) filters. You can get them cheaply from real no-name manufacturers or really expensive from Hoya, B &W and even Lee. Personally I have mixed feelings about this. The reason is this:
Suppose I buy a really good lens, Nikon high end or Canon L, which means that these front elements are hardened and coated already for protection. Do I need additional protection?
Also, any glass in front of the front elements can cause light diffraction, that’s why some UV filters cost so much, they become virtually invisible. But then comes the question of should I buy only expensive filters and if so, why make cheap ones?
Another good point to take into consideration is if your filter shatters , you might run into other problems as shown on this australian site. According to lensrentals.com, even shattering a front element can still give you pretty good images as can be seen on their website.
This information begs the question as to WHY to use a filter? Some people say it shows you take care of your lens and some lenses, like the Canon 17-40L, require a filter to complete their weathersealing (which is beyond me!!).
I am not sure a UV or protector filter is required and to be honest having the lens cap on when you are not using the lens does the same trick. You should put the lens hood on anyway when you shoot and while it is just plastic (mostly), it will dampen the fall or hit better than a filter.
I DO have filters almost always on but VERY rarely UV or Protectors. I prefer polarizers or ND (Neutral Density) filters, at least they have a purpose. One thing to note still: remember that if you want to stack your filters, most likely you will get some vignetting so you would ahve to remove the UV filter first before attaching the Polarizer or ND filter… what a hassle.. no thanks.
Just think before you buy UV’s for all your lenses.
