Yes; as Ian says, you've got it right. The old rule of thumb was that the diffusion enlargers needed one grade of paper higher. Of couse, they were strictly diffusion, not diffusion with condensors. It is not only dust and defects that the diffusion helps with: it tends to reduce the dreaded Callier Effect. BTW, the Meopta enlargers are real sleepers--great machines for the money. You may want to try to find a glass less neg carrier, though; if yours does not have one. Have fun.