Ok, so I was using my square nd filters which i stacked 3 together(0.3,0.6,0.9) and i was taking photos on a sunny dayof flowing water. When i used my cameras settings on aperture priority mode my photos came out really underexposed (like nearly black) and when i went on auto settings the same thing happened! Why is this happening? How can I fix this? How can I stop it from happening?!
PS sorry this is my first time using nd filters
Added (1). i am using a nikon d3300, viewfinder and no exposure compensation
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Photos are underexposed?!