In your experience, what is the shortest focal length lens that you can focus (at infinity) on your Zone VI 4x5 camera?

I had a Graflex Optar 90/6.8 that I couldn't focus at infinity on my Zone VI, not even with the bag bellows. Does that seem right, or was I doing something wrong? I sold that lens, and the shortest focal length I have now is a 115mm, which focuses just fine.

Any insight into this will be much appreciated. TIA.

Best wishes,