至于您说的EF,建议您看看Richard Binder的评论,
“We include extra-fine nibs (XF) as a specialty grind because Pelikan’s standard extra-fine nibs (labeled EF) do not meet my quality standards; they are inconsistent in flow, smoothness, and stroke width. If you order an extra-fine nib for your Pelikan pen, I will regrind a standard fine nib to create a smooth, reliable extra-fine writing experience for you. ”