{"id":852,"date":"2008-06-30T12:43:44","date_gmt":"2008-06-30T03:43:44","guid":{"rendered":"https:\/\/regex.info\/blog\/2008-06-30\/852"},"modified":"2013-08-28T13:45:47","modified_gmt":"2013-08-28T04:45:47","slug":"a-few-polarization-filter-examples","status":"publish","type":"post","link":"https:\/\/regex.info\/blog\/2008-06-30\/852","title":{"rendered":"A Few Polarization-Filter Examples"},"content":{"rendered":"\n\n<p>The photo below, of pizza at a cafe, appeared on <a\nhref=\"\/blog\/2008-06-28\/851\">my previous post<\/a>. <span class='nobr'>It was taken<\/span> with <span class='nobr'>a polarizing<\/span> filter on the lens adjusted to block glare from the\nwindow in the background. Mouseover the &#8220;Without Polarizer&#8221; button below\nfor the same scene two seconds later, without the filter...<\/p>\n\n<script type='text\/javascript'>\nfunction show(letter, extra)\n{\n    document.getElementById(letter + \"2\").style.visibility = 'hidden';\n    document.getElementById(letter + \"_h\").style.backgroundColor = '';\n    if (! extra) {\n       document.getElementById(letter + \"1\").style.visibility = 'visible';\n       document.getElementById(letter + \"_s\").style.backgroundColor = 'red';\n    } else if (extra == \"1\") {\n       document.getElementById(letter + \"1\").style.visibility = 'visible';\n       document.getElementById(letter + \"3\").style.visibility = 'hidden';\n       document.getElementById(letter + \"_s\").style.backgroundColor = 'red';\n       document.getElementById(letter + \"_s2\").style.backgroundColor = '';\n    } else {\n       document.getElementById(letter + \"3\").style.visibility = 'visible';\n       document.getElementById(letter + \"1\").style.visibility = 'hidden';\n       document.getElementById(letter + \"_s2\").style.backgroundColor = 'red';\n       document.getElementById(letter + \"_s\").style.backgroundColor = '';\n    }\n\n}\nfunction hide(letter, extra)\n{\n    document.getElementById(letter + \"2\").style.visibility = 'visible';\n    document.getElementById(letter + \"1\").style.visibility = 'hidden';\n    document.getElementById(letter + \"_s\").style.backgroundColor = '';\n    document.getElementById(letter + \"_h\").style.backgroundColor = 'red';\n    if (extra) {\n       document.getElementById(letter + \"3\").style.visibility = 'hidden';\n       document.getElementById(letter + \"_s2\").style.backgroundColor = '';\n    }\n}\n<\/script>\n\n\n   <div class='ic tight' style='position:relative; margin-bottom:20px'>\n<div id='x851d1' style='visibility:visibile; margin:0; width:100%'><div style='margin-top:0; margin-bottom:0' class='ic'>\n<a name='054729' href=\"\/i\/JEF_054729.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054729_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i054729\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 24 mm &mdash; <sup>1<\/sup><big>\/<\/big>90 sec, <span class='f'>f<\/span>\/2.8, ISO 500 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054729.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054729.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div><\/div>\n\n    <div id='x851d2' style='visibility:hidden; margin:0; width:100%;position:absolute; left:0; top:0'><div style='margin-top:0; margin-bottom:0' class='ic'><a name='054730' href=\"\/i\/JEF_054730.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054730_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"\"\nid=\"i054730\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 24 mm &mdash; <sup>1<\/sup><big>\/<\/big>125 sec, <span class='f'>f<\/span>\/2.8, ISO 500 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054730.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054730.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div><\/div><\/div>\n\n\n  <center>\n    <span id='x851d_s' class='button' onmouseover='show(\"x851d\")'>With Polarizer<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851d_h' class='button' onmouseover='hide(\"x851d\")'>Without Polarizer<\/span>\n    <br\/>\n  mouseover button to see that image\n  <\/center>\n  \n\n<script type='text\/javascript'>show(\"x851d\")<\/script>\n\n<p>The difference is striking.<\/p>\n\n<p>Without the filter, the reflections on the pizzas, table, and glasses of\nwater just destroy the scene. <span class='nobr'>I'm glad I<\/span> happened to have brought the my\npolarization filter that day. In the &#8220;Without Polarizer&#8221; picture, the\nfilter is still actually on the lens, but rotated so that it doesn't comb\nout the reflections.<\/p>\n\n<p>Normally, the individual waves that make up light are not &#8220;oriented&#8221; in\nany particular direction, so <span class='nobr'>a filter<\/span> designed to comb out light waves\nhaving <span class='nobr'>a particular<\/span> orientation doesn't do much except dim the whole scene <span class='nobr'>a\nbit<\/span> (because it removes the few percent of waves that happen to have that\norientation). However, in some situations, all the waves of <span class='nobr'>a particular<\/span>\nlight find themselves oriented at the same angle &ndash; it's\n<i>polarized<\/i> light &ndash; so filtering for <i>that<\/i> angle stops all\n<i>that<\/i> light, while only slightly dimming the rest of the light.<\/p>\n\n<p>In the scene above, the background glare reflected from the pizzas,\ntable, and water glasses was polarized, so <span class='nobr'>I simply<\/span> rotated the filter in\nfront of the lens until the reflections dimmed... they dimmed because the\nangle of the filter &#8220;comb&#8221; matched the orientation of the waves making up\nthe glare, thereby blocking it.<\/p>\n\n<p>This next example (from our <a\nhref=\"\/blog\/2008-03-08\/757\" class='quiet'>trip to\nKanazawa<\/a>) shows that the filter blocked almost all the reflection of\nthe sky, but left the locally-lighted reflection of the water glass...<\/p>\n\n<div class='ic' style='width:491px; position:relative'>\n\n    <div id='x851c1' style='width:479px'><a name='047029' href=\"\/i\/JEF_047029.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_047029_sm.jpg\" width=\"465\" height=\"700\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i047029\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 85mm f\/1.4  &mdash; <sup>1<\/sup><big>\/<\/big>250 sec, <span class='f'>f<\/span>\/5, ISO 400 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_047029.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_047029.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n    <div id='x851c2' style='width:479px;position:absolute; left:0; top:0'><a name='047030' href=\"\/i\/JEF_047030.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_047030_sm.jpg\" width=\"479\" height=\"700\"\nalt=\"\"\nid=\"i047030\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 85mm f\/1.4  &mdash; <sup>1<\/sup><big>\/<\/big>250 sec, <span class='f'>f<\/span>\/5, ISO 400 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_047030.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_047030.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n\n  <div style='margin-top: 15px; margin-bottom:8px'>\n    <span id='x851c_s' class='button' onmouseover='show(\"x851c\")'>With Polarizer<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851c_h' class='button' onmouseover='hide(\"x851c\")'>Without Polarizer<\/span>\n    <\/div>\n  mouseover button to see that image\n\n<\/div>\n\n<script type='text\/javascript'>show(\"x851c\")<\/script>\n\n<p>Wikipedia has a detailed discussion of <a\nhref=\"http:\/\/en.wikipedia.org\/wiki\/Polarization\">the physics of\npolarization<\/a>, but for practical photographic applications, <a\nhref=\"\/blog\/2007-10-31\/618\">Light &mdash; Science and\nMagic<\/a> is excellent.<\/p>\n\n<p>It's not always easy to predict what light will be polarized when, or to\nwhat extent, but modern polarization filters can be freely rotated while\naffixed to the lens, so it's <span class='nobr'>a simple<\/span> matter of rotating the lens <span class='nobr'>a bit<\/span> to\nsee what, if any, light is attenuated. When there's <span class='nobr'>a lot<\/span> of polarized\nlight, <span class='nobr'>a polarization<\/span> filter adds additional ways to be creative. Consider\n<span class='nobr'>a close<\/span>-up of yesterday's pizza...<\/p>\n\n<div class='ic' style='position:relative'>\n\n    <div id='x851e1' class='ic tight'><a name='054731' href=\"\/i\/JEF_054731.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054731_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i054731\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 45 mm &mdash; <sup>1<\/sup><big>\/<\/big>60 sec, <span class='f'>f<\/span>\/2.8, ISO 500 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054731.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054731.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n    <div id='x851e2' class='ic' style='position:absolute; margin:0; width:100%; left:0; top:0'><a name='054732' href=\"\/i\/JEF_054732.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054732_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"\"\nid=\"i054732\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 45 mm &mdash; <sup>1<\/sup><big>\/<\/big>30 sec, <span class='f'>f<\/span>\/2.8, ISO 500 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054732.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054732.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n\n  <div style='margin-top: 0px; margin-bottom:8px'>\n    <span id='x851e_h' class='button' onmouseover='hide(\"x851e\")'>With Polarizer<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851e_s' class='button' onmouseover='show(\"x851e\")'>Without Polarizer<\/span>\n    <\/div>\n  mouseover button to see that image\n\n<\/div>\n<script type='text\/javascript'>show(\"x851e\")<\/script>\n\n<p>Without the filter, the glare just destroys the picture, but with the\nfilter at full effect, the pizza looks dull and lifeless. Well, it's <span class='nobr'>a\npizza,<\/span> so it <i>is<\/i> lifeless, but it need not be dull, so if <span class='nobr'>I had<\/span> been\nserious about making <span class='nobr'>a portrait<\/span> of the pizza instead of eating it, <span class='nobr'>I'd likely<\/span> have tried rotating the filter such that <span class='nobr'>a touch<\/span> of glare was left\nto enhance the 3-D look of the surface.<\/p>\n\n<p>In this wider shot, though, where the pizza is not the whole image, <span class='nobr'>I'm happy<\/span> to forego sparkle in the pizza\nin order to reveal the richness of the table's wood grain... richness that without the filter the glare blows away.<\/p>\n\n<div class='ic tight' style='width:702px; position:relative'>\n\n    <div id='x851f1' class='ic tight'><a name='054736' href=\"\/i\/JEF_054736.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054736_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i054736\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 34 mm &mdash; <sup>1<\/sup><big>\/<\/big>100 sec, <span class='f'>f<\/span>\/2.8, ISO 500 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054736.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054736.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n    <div id='x851f2' class='ic tight'  style='width:100%; margin:0; position:absolute; left:0; top:0'><a name='054737' href=\"\/i\/JEF_054737.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054737_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"\"\nid=\"i054737\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 34 mm &mdash; <sup>1<\/sup><big>\/<\/big>160 sec, <span class='f'>f<\/span>\/2.8, ISO 500 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054737.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054737.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n\n  <div style='margin-top: 15px; margin-bottom:8px'>\n    <span id='x851f_s' class='button' onmouseover='show(\"x851f\")'>With Polarizer<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851f_h' class='button' onmouseover='hide(\"x851f\")'>Without Polarizer<\/span>\n    <\/div>\n  mouseover button to see that image\n\n<\/div>\n<script type='text\/javascript'>show(\"x851f\")<\/script>\n\n\n<p>It's less clear to me what to do with the salad...<\/p>\n\n<div class='ic tight' style='width:702px; position:relative'>\n\n    <div id='x851g1' class='ic tight'><a name='054740' href=\"\/i\/JEF_054740.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054740_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i054740\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 48 mm &mdash; <sup>1<\/sup><big>\/<\/big>80 sec, <span class='f'>f<\/span>\/2.8, ISO 640 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054740.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054740.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n    <div id='x851g2' class='ic tight' style='width:100%; margin:0; position:absolute; left:0; top:0'><a name='054741' href=\"\/i\/JEF_054741.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_054741_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"\"\nid=\"i054741\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 48 mm &mdash; <sup>1<\/sup><big>\/<\/big>60 sec, <span class='f'>f<\/span>\/2.8, ISO 640 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_054741.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_054741.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n\n  <div style='margin-top: 15px; margin-bottom:8px'>\n    <span id='x851g_h' class='button' onmouseover='hide(\"x851g\")'>With Polarizer<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851g_s' class='button' onmouseover='show(\"x851g\")'>Without Polarizer<\/span>\n    <\/div>\n  mouseover button to see that image\n\n<\/div>\n<script type='text\/javascript'>show(\"x851g\")<\/script>\n\n<p>I was just playing around with the filter prior to more important tasks\n(eating), so <span class='nobr'>I didn't<\/span> notice that the focus point slipped between the two\npictures, and that focus difference has <span class='nobr'>a greater<\/span> effect on the overall\nfeel than the glare or lack thereof.<\/p>\n\n<p>Reflections aren't always a bad thing. <span class='nobr'>The polarization<\/span> filter pretty\nmuch destroys the shot below, from our trip to <a\nhref=\"\/blog\/2008-02-25\/749\">the Heian Shrine during <span class='nobr'>a rare<\/span>\nsnowfall<\/a>....<\/p>\n\n<div class='ic tight' style='width:702px; position:relative'>\n\n  <div id='x851a1' class='ic tight'><a name='046627' href=\"\/i\/JEF_046627.jpg\"\n  ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_046627_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i046627\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n  <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 17 mm &mdash; <sup>1<\/sup><big>\/<\/big>80 sec, <span class='f'>f<\/span>\/2.8, ISO 400 &mdash;\n  <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_046627.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_046627.jpg\">nearby photos<\/a><\/span><\/span>\n  <\/div>\n\n  <div id='x851a2'  class='ic tight' style='width:100%; margin:0; position:absolute; left:0; top:0'><a name='046628' href=\"\/i\/JEF_046628.jpg\"\n  ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_046628_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"\"\nid=\"i046628\"\/><\/a>\n  <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 17-55 f\/2.8 @ 17 mm &mdash; <sup>1<\/sup><big>\/<\/big>125 sec, <span class='f'>f<\/span>\/2.8, ISO 400 &mdash;\n  <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_046628.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_046628.jpg\">nearby photos<\/a><\/span><\/span>\n  <\/div>\n\n  <div style='margin-top: 15px; margin-bottom:8px'>\n    <span id='x851a_s' class='button' onmouseover='show(\"x851a\")'>With Polarizer<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851a_h' class='button' onmouseover='hide(\"x851a\")'>Without Polarizer<\/span>\n    <\/div>\n  mouseover button to see that image\n\n<\/div>\n\n<script type='text\/javascript'>show(\"x851a\")<\/script>\n\n<p>Well, okay, it was my composition that destroyed these shots because\nboth are pretty pathetic, but you can see how much more interesting <span class='nobr'>a\nwell<\/span>-composed shot would be with the reflections of the snowy branches left\nin tact.<\/p>\n\n<p>Some things, like Plexiglas, or glass under stress, polarize light\npassing through in sort of random ways that can reveal internal stresses\n&ndash; useful for scientific and safety applications &ndash; but which\nmake <span class='nobr'>a polarizer<\/span> fairly useless. Here's <span class='nobr'>a scene<\/span> from the <a\nhref=\"\/blog\/2008-06-13\/837#047000\">Geometric Richness in\nKanazawa Station<\/a> that shows unsightly patterns regardless of the angle\nthe polarization filter is rotated to...<\/p>\n\n\n<div class='ic tight' style='width:702px; position:relative'>\n    <div id='x851b1' class='ic tight'><a name='047001' href=\"\/i\/JEF_047001.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_047001_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\nid=\"i047001\"\ntitle=\"Copyright 2008 Jeffrey Eric Francis Friedl\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 85mm f\/1.4 &mdash; <sup>1<\/sup><big>\/<\/big>180 sec, <span class='f'>f<\/span>\/4.5, ISO 100 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_047001.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_047001.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n    <div id='x851b2' class='ic tight' style='width:100%; margin:0;position:absolute; left:0; top:0'><a name='047002' href=\"\/i\/JEF_047002.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_047002_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"\"\nid=\"i047002\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 85mm f\/1.4 &mdash; <sup>1<\/sup><big>\/<\/big>250 sec, <span class='f'>f<\/span>\/4.5, ISO 100 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_047002.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_047002.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n\n    <div id='x851b3' class='ic tight' style='width:100%; margin:0;position:absolute; left:0; top:0'><a name='047000' href=\"\/i\/JEF_047000.jpg\"\n    ><img loading=\"lazy\" decoding=\"async\" src=\"\/i\/JEF_047000_sm.jpg\" width=\"690\" height=\"462\"\nalt=\"Catwalks under the roof of the atrium outside Kanazawa Station (Kanazawa, Japan)\"\nid=\"i047000\"\ntitle=\"Catwalks under the roof of the atrium outside Kanazawa Station (Kanazawa, Japan)\"\/><\/a>\n    <br\/><span class=\"camera-info robots-nocontent\">Nikon D200 + Nikkor 85mm f\/1.4 &mdash; <sup>1<\/sup><big>\/<\/big>500 sec, <span class='f'>f<\/span>\/4.5, ISO 100 &mdash;\n    <span class='nobr'><a href=\"\/imageinfo.cgi?url=http%3A%2F%2Fregex.info%2Fi%2FJEF_047000.jpg\">map &amp; image data<\/a> &mdash; <a href=\"\/blog\/proximity\/i\/JEF_047000.jpg\">nearby photos<\/a><\/span><\/span>\n    <\/div>\n\n\n  <div style='margin-top: 15px; margin-bottom:8px'>\n    <span id='x851b_s2' class='button' onmouseover='show(\"x851b\", 2)'>Polarizer Removed<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851b_h' class='button' onmouseover='hide(\"x851b\", 1)'>With Polarizer #1<\/span>\n    &nbsp;&middot;&nbsp;\n    <span id='x851b_s' class='button' onmouseover='show(\"x851b\", 1)'>With Polarizer #2<\/span>\n    <\/div>\n  mouseover button to see that image\n<\/div>\n<script type='text\/javascript'>show(\"x851b\", 1)<\/script>\n\n<p>In these cases, you do have to physically remove the filter from the lens\nin order to avoid the patterns, because they appear to some extent at all\nrotations of the filter.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>The photo below, of pizza at a cafe, appeared on my previous post. It was taken with a polarizing filter on the lens adjusted to block glare from the window in the background. Mouseover the \"Without Polarizer\" button below for the same scene two seconds later, without the filter...<\/p> With Polarizer &nbsp; - &nbsp; Without Polarizer mouseover button to see that image <p>The difference is striking.<\/p> <p>Without the filter, the reflections on the pizzas, table, and glasses of water just destroy the scene. I'm glad I happened to have brought the my polarization filter that day. In the \"Without Polarizer\" [...]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,7,29,10],"tags":[],"_links":{"self":[{"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/posts\/852"}],"collection":[{"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/comments?post=852"}],"version-history":[{"count":0,"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/posts\/852\/revisions"}],"wp:attachment":[{"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/media?parent=852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/categories?post=852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/regex.info\/blog\/wp-json\/wp\/v2\/tags?post=852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}