hollis_f wrote in post #8895682
- All UV/Protective filters will impair image quality.
- With high-quality/high-cost filters that impairment is minimised, but not eliminated.
A cheap filter will have loses of 7%, a good filter will have 'loses' of 0.7% I challenge anyone to see 0.3% affect in ordinary shooting circumstances during the day when a hood helps prevent flare.
A really bad filter will even distort the image, or cause the image to be unsharp. A very long time ago, I once crushed a Tiffen linear polarizing filter (rather than resell that POS to some unsuspecting person) because I could see definite distortions with the naked eye as I rotated the filter.
hollis_f wrote in post #8895682
- A 1mm thin piece of galss will not protect your front element from any impact energetic enough to damage that front element
- A 1mm thin piece of glass will protect your lens from grubby fingers, windblown sand or salt-spray and other such things.
And since filters are removeable, not permanent, one can always choose to use a filter in adverse conditions and remove a filter when the situations are especially demanding and the filter could make itself visible even when it only has a 0.3% affect on an image.
hollis_f wrote in post #8895682
- With longer lenses a hood provides adequate protection and enhances image quality
...except for grubby fingers, windblown sand or salt-spray and
wind blown salt spray
hollis_f wrote in post #8895682
I don't think anybody could argue with those facts (actually, I'm expecting people to disagree with all of them). Taking them into account - I use a UV filter when shooting in conditions where the wind can blow nasty stuff onto my lens. I never shoot near children or drunks. I always use a hood. I always use a lens-cap when not shooting.
Having toddler grandkids visiting my home, and shooting photos of them for my wife to show off her grandkids to her friends, I do experience the goopey fingers getting everywhere including the fronts of my lenses. 