yes all about angle, at times it'll seem to have no effect at all directly at sun or behind it, but i often find with sun behind I'm still able to get some reflections or certain parts of sky to turn blue. when you put it on you immediately realize the scene through view finder is darker, and it's very dark indoors. the position of the filter marking is almostirrelevant(at least for me) since you would look through the view finder, focus, zoom, and rotate the CPL to get to the desired sky or color an shoot. I never bother looking at the rotation of the CPL since like the above post, different angle to the sun different rotation, and the only way to tell is to look through the view finder. Hope that's more clear.


I got Heliopan instead of Hoya(I think somewhere in the review, there's another brand that's very well regarded.), hard that Hoya flakes off after few uses, I doubt that'll ever happen but i'm not really to risk my shots with such expensive glass and cheap filter.