Amazon.com : B + W 77mm UV Protection Filter (010) for Camera Lens – Standard Mount (F-PRO), MRC, 16 Layers Multi-Resistant Coating, Photography Filter, 77 mm, Clear Protector : Camera Lens Sky
How Black & White Filters Work – Hoya Filters
B+W 77mm #13 Green (061) Filter 65071555 B&H Photo Video
B+W 77mm Graduated Blue 581 Filter 65-063892 B&H Photo Video