NOOB Question About Close UP 4x5 LF Lenses

[gearhed]

Hello everyone,

I started a thread previously about a good large format camera. I went with the Sinar F 4x5 field camera on the monorail according to the suggestions. So, thanks to everyone on helping me with my first purchase.

First mistake I made was not extending the bellows fully and was not able to get focus with the Schneider Kreuznach 1:5,6/210 on a door across
a rather small office room. I am learning though.Here is the camera that I purchased off ebay:

https://www.ebay.com/itm/MINT-SINAR-...rdt=true&rt=nc

Now, my subject will be B&W and shot at a distance of about 1 foot away I am trying to fill the entire negative. I am filming multiple pieces of tree bark that are cut into sections that are 6x3 inches give or take.

Problem: The Schneider Kreuznach 1:5,6/210 lens does not seem to focus on objects this close at all.

Question: What is a suitable lens for close up flat surfaces that that can focus easily? I want the camera as close as possible for the detail and for the 6X3 bark
samples to fill the entire screen.

Again, thanks. You guys are a great at answering questions from new guys.