• Delta Lens Grading
Introduction The Delta Hall of Fame grades for sharpness 200 enlarger, projector and industrial lenses at two working distances. Lenses that score 90%+ are awarded Gold – reference-quality.Lenses that score 80-90% are awarded Silver – serviceable for professional use.Lenses that score 70-80% are awarded Bronze – borderline suitable or obviously compromised.Lenses that score below 70% …