[markbarendt]

I dont have any ND filters, but I'm glad you brought that up. Would you happen to know what kind/size of filters I need for a Speed Graphic with this lens?

If I had to make a Scientific Wild Ass Guess I'd say 49mm, roughly 1.93" (just shy of 1-15/16").

Put a ruler to it, just remember that thread sizes are measured to the outside of the threads.