big apertures are great for low light and you wouldn't be using it to its full potential if youre stopping light from getting in
I disagree for 2 reasons:
-Using a ND filter on a 50mm lens at an aperture of 1.8 is not pointless. It's useful in any situation that requires a shallow DOF
and a long exposure in bright conditions.
-You just cannot
use a 1.8 aperture for landscape photography (the main reason the OP wants to use it for). The picture would be completely out of focus because at F1.8 you get a shallow DOF
In landscape photography everything needs to be in focus and to achieve that you normally use apertures smaller (Higher F number) than F8, regardless of the lens used and it's focal length.
Your first reason, being true
, doesn't really apply to this situation at all because, sunsets are usually almost considered lower than daylight conditions.
I apologize for the confusion, I was merely stating the general nature of this type of lens. I'm not saying that it's a rule not to use a filter with this lens, I'm just saying that you're not using the lens to it's full potential under LOW LIGHT situations
given that you're shooting anything BUT landscapes.
Nevertheless, I think we can both agree that the 50mm f1.8 isn't the ideal lens for this kind of shooting (or so I hope)