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Negative sharpness in contact printing



People:

I use an old contact printer with a useable area of around 10 inches by 13 inches, which is perfect for 8x10 negatives. There is a 1.5mm neoprene sheet on top of the negative/paper sandwich. 

However, I have noticed that when I print some of my 5x4 negatives, they look quite soft. Yet the same negatives in the enlarger, printed onto silver paper are more  than acceptably sharp. Other negatives contact print adequately sharp, but are no sharper (or seem so) in the enlarger than those that look soft.

Do you think this is simply an issue of not making proper contact of negative and sensitised paper, or is there something else I should explore - like getting sharper negatives :) ?

Thanks

Peter.




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