Quote Originally Posted by Rinthe View Post
ok i guess copal #0 doesn't exist for this particular lens.

But I want to know if the copal # affects the image quality at all?

The Shutter is positioned at or very close to the Nodal Point of the lens

The Glass Elements, their coatings and the quality of the light baffling of the Lens Barrel are the main players in optical quality.

Of course if you are looking at second hand pieces of glass, how much TLC or abuse your lens has seen makes a huge difference to its performance