Enlarger!? That explains your other quesion in the Printers forum then...

If you're really enlarging digital negatives, you're probably seeing the printer's dithering pattern.
As Joe says: digital negatives are used for contact printing only... I mean those done with an inkjet printer. (I think 8000dpi film recorder negatives - which are real film negatives, where the source image is digital - may be enlarged pretty successfully, BUT w/o pushing too much!)
Regards,
Loris.