Thank you guys, these are all good advises. I will try get a single sided glass carrier , but I am not sure my Beseler 23-CII-XL has this accesory. Besides the Dichro head, I also have a condenser head. I was told by an engineer I could get a more contrasty print by using a condenser head, and in fact I found that is the case. (at the expense of a few specs of dust that show). Now when I say sharp, I also mean the level of detail I can perceive. Having worked my way down from Digital, where I can actually see the texture of a person's skin (magnificent detail reproduction) , I am not sure if this is a dream on optical printing, at least with 35mm which is all I can do.