My understanding about FC is that if the eyepiece FC matches the scope FC, it cancels out - that is ) ) or ( ( results in the minimization of visible FC.
I have a couple of finder scopes with short focal lengths (225mm and 160mm) that accept 1.25" eyepieces. The eyepiece I'm using in my 225mm focal length finder is good but definitely shows the FC inherent to the finder. This means faint stars near the edges can be mistaken for galaxies or nebulae and you need to center them to see if what you're looking at is actually the target or not.
I was wondering if anyone knows of eyepieces that either deliberately or serendipitously are good for use in finder scopes or otherwise short focal length refractors.