hi, I bought recently a toyo 45 G View and a friend lent me a Grandagon 75 mm 6.8. The lens doesn't focus to infinity, I have to use a specific recessed lens board or just mount the soft bellows (that i don't have)? The lens now is mounted on its 94x94mm Sinar lens board, if I use a recessed lens board, do I have to unscrew the lens from its board and mount it on the other, or are there recessed lens boards with sinar board adapter? The dimensions of the Toyo lens board are 140x140 mm.

Sorry if I asked a question that maybe is already answered in some other threads, but I'm new to the large format's world and I feel a bit lost in the infinity of options available for any particular photographic need !!!