I need to find a portrait lens for my new 8x10 which is use exclusively for wetplate. Speed is a huge concern with this so I'd need faster than f/6 if at all possible. I'd like to get something in a portrait length so 16"+.

As a working photographer I'm apparently not rich enough to spend what most long fast lenses are going for so I'm wondering whether there are other options? I've been using a projector lens that's 18-f/3.7 but it's not making the prettiest images.

I hate when people make posts like this since I'm sure the information is out there if I dig for a week. So apologies in advance.

Any suggestions welcome.