What do you need the f6.8 for? I ask as most LF lenses are not performing at their best at wide open.

I use the 355mm G Claron a lot. One thing that always surprises me is the brightness of the image that it projects, even on the edges of my 7x17” ground glass.

If you’re worried about image brightness, I would suggest it’s not as big an issue as it is with WA lenses.

PS, the 355 Claron is amazing...