Originally posted by ElJamoquio There's a Rokinon one that's allegedly not bad. Haven't tried it myself.
---------- Post added 04-08-15 at 06:02 PM ----------
I'd put it as 'Focus them to a degree of accuracy that is difficult to attain on cameras+viewfinders that are optimized for autofocus'
For sure, there is nothing in the digital world that compares to looking at an 8 inch by 10 inch glass plates, and seeing on it, exactly what you're going to capture on your images. If you contact print it as an 8x10, what you see is exactly what you get.