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If you want to emulate ND filters with a lens like the 14-24mm Nikon simply take several shots and stack them. You'll get the same blurred water effect on waterfalls, streams etc. That's a great lens and similar to the Sigma Art 14 1.8 which has a large bulbous front element as well.
Sony A7rii has an app that does exactly that and it was popular.
I have recently used that technique and it worked well.
You need a stable resting point for the camera or a tripod. You could even vary the focus point from close to far in the several exposures to get focus stacking and a very deep depth of field.
ND filters have their own set of problems as well like some cause colour shift, some can create an X shape when pushed too hard. They are another thing to carry and clean.
Greg.
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