{"id":44974,"date":"2026-09-11T17:20:59","date_gmt":"2026-09-11T17:20:59","guid":{"rendered":"https:\/\/garfnet.org.uk\/cms\/?page_id=44974"},"modified":"2026-09-14T23:29:46","modified_gmt":"2026-09-14T23:29:46","slug":"photography-neutral-density-filters","status":"publish","type":"page","link":"https:\/\/garfnet.org.uk\/cms\/tables\/general\/photography-neutral-density-filters\/","title":{"rendered":"Photography neutral density filter equivalents"},"content":{"rendered":"<p><strong>There are several different ways one can express how much attenuation a neutral density (ND) filter offers. Why? It is because they are really describing the same physical attenuation, using different units of measurement. Think of an ND filter as a device that reduces light. That reduction can be expressed in several equivalent ways:<\/strong><\/p>\n<ul>\n<li>\u201cIt transmits 10% of the light.\u201d<\/li>\n<li>\u201cIts optical density is 1.0.\u201d<\/li>\n<li>\u201cIt has a filter factor of 10.\u201d<\/li>\n<li>\u201cIt&#8217;s a 3.32-stop filter.\u201d<\/li>\n<\/ul>\n<p>All of those describe basically the same type of ND filter. Anyway this is my attempt to rationalise that and bring it all together on a table of equivalents.<\/p>\n<div class=\"garf-info-2-table-wrap\"><table id=\"garf-info-2-1\" class=\"garf-info-2-table mtr-table mtr-thead-th\"><thead><tr><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"ND 1 Number\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=ND%201%20Number&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">ND 1 Number<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"ND Number\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=ND%20Number&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">ND Number<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"ND Filter Number\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=ND%20Filter%20Number&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">ND Filter Number<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"Relative Transmission\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=Relative%20Transmission&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">Relative Transmission<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"Optical Density\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=Optical%20Density&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">Optical Density<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"F-Stop Reduction\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=F-Stop%20Reduction&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">F-Stop Reduction<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"Trans. %\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=Trans.%20%&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">Trans. %<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"Fractional Trans.\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=Fractional%20Trans.&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">Fractional Trans.<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><th scope=\"col\" class=\"garf-info-2-sortable mtr-th-tag\" aria-sort=\"none\" data-mtr-content=\"Scientific Trans.\"><div class=\"mtr-cell-content\"><a href=\"\/cms\/wp-json\/wp\/v2\/pages\/44974?garf_sort=Scientific%20Trans.&amp;garf_dir=asc&amp;garf_page=1&amp;garf_size=100\" class=\"garf-info-2-sort\">Scientific Trans.<span class=\"garf-info-2-sort-indicator\" aria-hidden=\"true\"><\/span><\/a><\/div><\/th><\/tr><\/thead><tbody><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">none<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">none<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">none<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">100<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.0000 \u00d7 10\u2070<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 101<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 0.3<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND2<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.5<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.3<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">50<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.5<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">5.0000 \u00d7 10\u207b\u00b9<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 102<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 0.6<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND4<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.25<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.6<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">25<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.25<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.5000 \u00d7 10\u207b\u00b9<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 103<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 0.9<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND8<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.125<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.9<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">12.5<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.125<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.2500 \u00d7 10\u207b\u00b9<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 104<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 1.2<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND16<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0625<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.2<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">4<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">6.25<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0625<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">6.2500 \u00d7 10\u207b\u00b2<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 105<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 1.5<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND32<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.03125<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.5<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">5<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.125<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.03125<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.1250 \u00d7 10\u207b\u00b2<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 106<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 1.8<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND64<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.015625<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.8<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">6<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.563<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.015625<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.5625 \u00d7 10\u207b\u00b2<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\"><\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 2.0<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND100<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.01<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">6.667<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.01<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.0000 \u00d7 10\u207b\u00b2<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 107<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 2.1<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND128<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0078125<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.1<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">7<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.781<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0078125<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">7.8125 \u00d7 10\u207b\u00b3<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 108<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 2.4<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND256<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.00390625<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.4<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">8<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.391<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.00390625<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.9062 \u00d7 10\u207b\u00b3<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\"><\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\"><\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND400<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0025<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.6<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">8.667<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.25<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0025<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.5000 \u00d7 10\u207b\u00b3<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 109<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 2.7<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND512<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.001953125<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.7<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">9<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.195<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.001953125<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.9531 \u00d7 10\u207b\u00b3<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 110<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 3.0<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND1024 (aka ND1000)<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.001<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">10<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.1<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.001<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.0000 \u00d7 10\u207b\u00b3<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 111<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 3.3<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND2048<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.00048828125<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.3<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">11<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.049<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.00048828125<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">4.8828 \u00d7 10\u207b\u2074<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 112<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 3.6<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND4096<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.000244140625<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.6<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">12<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.024<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.000244140625<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">2.4414 \u00d7 10\u207b\u2074<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\"><\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 3.8<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND6310<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.00015849<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.8<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">12.667<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.016<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.00015849<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.5849 \u00d7 10\u207b\u2074<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 113<\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 3.9<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND8192<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.000122070313<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">3.9<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">13<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.012<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.000122070313<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.2207 \u00d7 10\u207b\u2074<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\"><\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 4.0<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND10000<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0001<\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">4<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">13.333<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.01<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.0001<\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.0000 \u00d7 10\u207b\u2074<\/div><\/td><\/tr><tr><td data-mtr-content=\"ND 1 Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\"><\/div><\/td><td data-mtr-content=\"ND Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND 5.0<\/div><\/td><td data-mtr-content=\"ND Filter Number\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">ND100000<\/div><\/td><td data-mtr-content=\"Relative Transmission\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1 \u00d7 10<sup>-5<\/sup><\/div><\/td><td data-mtr-content=\"Optical Density\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">5<\/div><\/td><td data-mtr-content=\"F-Stop Reduction\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">16.667<\/div><\/td><td data-mtr-content=\"Trans. %\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">0.001<\/div><\/td><td data-mtr-content=\"Fractional Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1 \u00d7 10<sup>-5<\/sup><\/div><\/td><td data-mtr-content=\"Scientific Trans.\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">1.0000 \u00d7 10\u207b\u2075<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n<p>&#8220;Trans.&#8221; in the context of the above table refers to transmittance.<\/p>\n<h2>Truly neutral?<\/h2>\n<p>There is another source of confusion, that is the use of the word &#8220;<em>neutral<\/em>.&#8221; A truly neutral-density filter should ideally have the same attenuation at all wavelengths. Whilst modern ND filters are pretty good, hardly any truly give equal attenuation at all wavelengths. Often it is a case of &#8220;good enough is perfect&#8221;.<\/p>\n<h2>More photographic utilities<\/h2>\n<ul>\n<li>You might also be interested in our Photographic Film and Sensor Equivalents table:-<br \/>\n<a href=\"https:\/\/garfnet.org.uk\/cms\/tables\/general\/photography-film-speeds\/\">https:\/\/garfnet.org.uk\/cms\/tables\/general\/photography-film-speeds\/<\/a><\/li>\n<li>Or our handy Depth of field Calculator applet:-<br \/>\n<a href=\"https:\/\/garfnet.org.uk\/dof\">https:\/\/garfnet.org.uk\/dof<\/a><\/li>\n<\/ul>\n<hr>\n<p style=\"text-align: center;\"><a href=\"..\/..\/..\/\">Home<\/a> | <a href=\"..\/..\/\">Tables<\/a> | <a href=\"..\/\">General<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are several different ways one can express how much attenuation a neutral density (ND) filter offers. Why? It is because they are really describing the same physical attenuation, using different units of measurement. Think of an ND filter as a device that reduces light. That reduction can be expressed in several equivalent ways: \u201cIt&#8230;<\/p>\n","protected":false},"author":1,"featured_media":44986,"parent":646,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-44974","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Photography neutral density filter equivalents - GarfNet<\/title>\n<meta name=\"description\" content=\"There are several different ways one can express how much attenuation a photographic &quot;neutral density filter&quot; offers.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/garfnet.org.uk\/cms\/tables\/general\/photography-neutral-density-filters\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Photography neutral density filter equivalents - 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