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When you say negatively affect the image, do you mean vignetting? Which can be an issue but easier to fix in post. Colour shift? An issue not related to focal length but again ok to deal with in post. Or the X type affect? I think that is mainly an issue with variable ND's at UWA focal lengths and is a nightmare to deal with.
greentricky
@DethBeard
Looking for an ND filter for an UWA lens.
Reading that variable NDs can negatively affect the image on shorter focal lengths (and this is for a 10-20mm)
Is this true of all NDs or just variables?