I have a Devere 203, fitted with a cathomag cold light head. This was bought in the days of graded paper (pre vc). Recently I had the chance to buy a dichromat head as well. My main reasons for the change were the slow speed of the cathomag for lith printing, and splitgrade printing with below the lens filteration is awkward. My question is; The prints made with the dichro seem have less apparent sharpnees than the cathomag. All other factors ie: film, paper, dev, lens aperture etc. have remained the same. Should this be so? or is it down to advancing years.