I used to enlarge a lot, but am doing less and less as contacts just have more intensity. Enlarged photos look a bit drab somehow. I use 'classic lenses', a dagor, kodak anastigmat, gundlach triple convertible, etc. and contact print everything from 3x4 up to 8x10. I like the look of these lenses and combined with contact printing the look is beautiful. I am not an expert in these matters!