Mirrorless / SLR / Pro Video / Accessories / Nauticam Focus Knob for 35mm II & 50mm II Extension Ring CloseNauticam Focus Knob for 35mm II & 50mm II Extension Ring Zoom Nauticam Focus Knob for 35mm II & 50mm II Extension Ring SKU: # na-22151 Price $141.00 Options Back Item IncomeAccount TaxCode Mapping UDF1 UDF2 UPC Code Pick Up Tax Amount Quantity -+ Add to Cart Add to Cart Custom Options Price as Configured Add to Cart View Cart Articles & Videos About This Item ALL ARTICLES ALL VIDEOS Overview / Product Description Nauticam Focus Knob for 35mm II & 50mm II Extension Ring 22135 / 22150