Obviously it was a thing for film cameras, but now that everything is digital, something like “just make the picture darker” seems extremely easy to do with software
quick edit, I know what ND filters are for and how to use them, no need to explain. it just seems to me that it could be engineered in a way that doesn’t require them, which is what I’m asking about
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Exposure time, film speed, aperture are all ways to control the amount of light coming in. This affects more than just how dark or light an image is. Aperture for example is used to control depth of field. Exposure time controls motion blur. If there’s a specific depth of field and exposure time you want to use but this would over expose the image, ND filters can be used to lower the amount of light coming in.
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