Originally posted by C.W Tsorotes Yer I can understand why now, how does the Raynox at F14 compare against a dedicated macro lens though?
It's very complicated to say, because DOF varies with focal length, so which macro lens are we to reference and which Raynox on which main lens? IME only (i.e. not researched or scientific in any way), I'd say that a Raynox 250 on a DA 55-300 gives about 50% dof compared to my D FA 100mm macro at 1:1 magnification. A dedicated macro lens is easier to use because of this, but if you look at the Raynox Club thread, you'll see that lots of people have gotten some pretty impressive results with the inexpensive Raynox.
I don't know what settings you used for the cat's eye, but if you were at infinity focus and 300mm, you were getting about 2.7:1 macro, far beyond what you'll get with a dedicated macro lens, and far less dof at this high magnification and long FL.