Hi I am new to enlarging and printing and understanding how things work in regards to this particular photographic process I have D2 enlarger with a 135mm lens which is scrachted and when I run my finger nail over the scratches lightly they do catch. I was wondering technically what scratches do to the lens in relation to producing a good image. Does the light fracture wrong or is cut into different directions causing problem areas in the printed image. Also, what do scracthes cause in addition to smudges on the final print...does it mess up the image grain pattern.....or what?
Thanks