90mm f6.8 Caltar II-N and Recessed Board

Hi,

I am not sure whether this question has been answered previously (a quick search goes back to March 2012 on the lens specs).

I just got this lens (Caltar II-N 90mm f6.8) and I have a Calumet 45 NX. I have a spare flat lens board (Copal 0) but I was wondering whether I need to use a recessed board. I have not received the lens yet. In addition, I have the normal bellows and I don't have a wide angle one.

In my previous experience with a view camera, I didn't need it but now I am wondering.

So, I will appreciate your input.

Many thanks in advance,

Regards