I say, if you only get one filter for a DSLR, makes sure it's a circular polarizer. Sure, ND Grads are nice, but this is the best all around filter IMO. I was without one for the longest time since I get rid of all my 52mm ring size lenses. Finally bought a 77mm filter for my bigger lenses.
Here's a quick example of how cool this filter is. It didn't completely get rid of the reflections since it all depends on the angle of the light source, but it will give you a good idea. These work great when shooting fish ponds, lakes, rivers, waterfalls, etc. They also work great on landscape shots.
My 57g planted tank
Without

With

Without

With

Here's a quick example of how cool this filter is. It didn't completely get rid of the reflections since it all depends on the angle of the light source, but it will give you a good idea. These work great when shooting fish ponds, lakes, rivers, waterfalls, etc. They also work great on landscape shots.
My 57g planted tank
Without

With

Without

With
