TomBenedict: Wratten Stack vs. Hoya IR
TomBenedict: Filter Transmission
TomBenedict: Graduated ND 0.6 Filter Comparison - Visible + Photographic IR
TomBenedict: Graduated ND 0.6 Filter Comparison - Visible through Near-IR
TomBenedict: Graduated ND 0.6 Filter Comparison - Visible
TomBenedict: Hitech / Tiffen Comparison