I recently got a new enlarger. An Omega DII. I have mostly printed with Besler enlargers in the past an am sued to having a filter drawer. This enlarger came with a set of below lens Ilfard multigrade filters and dose not have a filter drawer above the lens. My friend who, Like me has always used above lens filters, says that the below lens filters will be problematic if any dust gets on them or they get scratched another experienced person I know says that it is not really a concern being as close to the lens as it is. I just want to know what others thoughts on this are or if anyone has a definitive answer. Thanks a lot.