Hello!

I know that the technical answer to my quiestion is "about a stop dimmer" but, practically speaking, how much of a difference is there?

I'm looking at getting a Chamonix 45N-2 for shooting nature and landscapes on 6x9 and occasionally 4x5. This will be my first view camera and I know that a dimmer image on the ground glass will be harder to focus, but how much harder?

Lenses with smaller maximum apertures are typically cheaper and lighter which is attractive but I worry that the image will be too dim?