Hi guys, I see many times Landscape photos. I jealous long exposure photos. I had bought a Haida ND3.0 1000x. I think in cases like Sunrises isn't appropriate this Filter. I am thinking to buy another ND filter And One GND. First i don't khow if i had to buy round or square ?? Can someone post the pros and cons to the two different type and why buy one over the other. I see that the square are much more expensive than the round. For the moment i will buy a ND and One GND. I use OMD EM1 with OLY 12-40 2.8.. But in the future i will buy Oly 7-14 2.8 Finally i post some failed photos i shot with Haida ND3.0 1000x.