Most hazards would not penetrate even a plain filter. BUT if you are often at the sidelines of a football game, or other activity where their is risk, it might be a good buy. I have been recommending a plain skylight fiter for 40 years now, just to avoid scraching from removing dust, if the filter gets worn, you can replace it.
the harder material may also be more scratch resistant, if you have to keep cleaning the filter because of rain or condensation.
It depends. How much more? $1? Maybe. Since I have not needed this level protection in over a half century+++ of photography, the risk reward cost has to be considered. JMHO
It depends. How much more? $1? Maybe. Since I have not needed this level protection in over a half century+++ of photography, the risk reward cost has to be considered. JMHO
If you bend a filter ring sometimes (or most of the time) the only way to get the resulting jammed filter off the lens is to gingerly break the glass and bend the ring with a pair of pliers. I can't imagine trying to do that with one of these filters so the net effect of having glass this strong is actually quite negative. That and in all my years of photography I have never seen an impact on a lens that ruined both the filter and the lens surface. Usually the mechanical elements give out first and render the lens useless regardless of how much if any damage is done to the glass. In other words these filters are a solution looking for a problem and in the process probably create a problem that doesn't have a solution.