B+W Master Clear Filter MRC Nano vs WR UV Filter: which is safer?
Sigma WR UV Filter is our pick: better on PFAS and on the overall hazard picture.
3M
B+W Master Clear Filter MRC Nano
PFAS grade
B 85/100
Overall grade
B 81/100
Verdict
Buy
Hazard flags
⚑ 1
Material
Optical glass with multi-coated lens elements
Confidence
78%
PossibleGlass fracture and sharp edge risk
Our pick
Sigma
WR UV Filter
PFAS grade
A 100/100
Overall grade
A 96/100
Verdict
Buy
Hazard flags
⚑ 1
Material
UV-absorbing optical glass or mineral coating
Confidence
72%
PossibleOptical coating degradation and microabrasion
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More waterproof camera & lens protection: see the full ranking