A polarizing filter can:
1. cut reflections which is useful for example after the rain, as reflections of wet surfaces reduce contrast,
2. and to make sky darker blue--when not using a wide angle lens
But for ocean it is often not a good idea because the sparkle due to sun reflecting off water is what makes it not look flat,
and often seeing below the water surface is also not what you want.
Not saying you may not want a polarizing filter when on a whale watch--but it is not a given that it is a good idea, and if you do use it you likely will want to turn it to only partial polarizing, for above reason 1.
|