{"id":154165,"date":"2021-05-07T06:00:00","date_gmt":"2021-05-07T11:00:00","guid":{"rendered":"https:\/\/www.premiumbeat.com\/blog\/?p=154165"},"modified":"2021-05-07T04:34:37","modified_gmt":"2021-05-07T09:34:37","slug":"circular-polarizer-filter-digital-noise","status":"publish","type":"post","link":"https:\/\/www.premiumbeat.com\/blog\/circular-polarizer-filter-digital-noise\/","title":{"rendered":"Does the Circular Polarizer Filter Cause Digital Noise?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-in-today-s-discussion-we-re-exploring-the-reasons-behind-digital-noise-and-whether-or-not-the-circular-polarized-filter-is-the-culprit\"><span id=\"in-todays-discussion-were-exploring-the-reasons-behind-digital-noise-and-whether-or-not-the-circular-polarized-filter-is-the-culprit\">In today&#8217;s discussion, we&#8217;re exploring the reasons behind digital noise, and whether or not the circular polarized filter is the culprit.<\/span><\/h2>\n\n\n\n<p>Are you familiar with the Metal Gear Solid alert sound effect? The video game uses it when an enemy spots you. However, in typical internet fashion, it\u2019s also a popular meme for when people notice something abnormal or suspicious while vlogging or live-streaming.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/8yGfQak-q9M?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><\/figure>\n\n\n\n<p>Recently, that sound effect has been firing off after I start grading footage from a day\u2019s shoot. And, I notice an abnormal amount of noise in the sky. Especially for a daytime shoot filmed on the base ISO. <\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-suspect\"><span id=\"the-suspect\">The Suspect<\/span><\/h3>\n\n\n\n<p>I\u2019ve recently become inseparable from my circular polarizer filter. With spring in full blossom and an unseasonal amount of sunshine in Wales, the circular polarizer was the perfect tool to produce deep, rich blues from a cloudless sky.<\/p>\n\n\n\n<p>If you\u2019re unfamiliar with what a circular polarizer filter is and what it does, check out the Shutterstock tutorial below.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/m384o8tLAD0?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><\/figure>\n\n\n\n<p>I\u2019m using the <a rel=\"noreferrer noopener\" href=\"https:\/\/www.premiumbeat.com\/blog\/canon-introduces-the-eos-c300-mark-iii\/\" target=\"_blank\" data-wpel-link=\"internal\">C300 Mark III<\/a>. And, at a base ISO in broad daylight, the image should be flawless. However, there have been a few shots recently where, after my grade, there\u2019s an apparent amount of noise in the sky and the sky only. Take a look at the shot below:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg\" data-wpel-link=\"internal\"><img loading=\"lazy\" decoding=\"async\" width=\"755\" height=\"400\" src=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg\" alt=\"Cherry Blossom CPL\" class=\"wp-image-154242\" srcset=\"https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg 755w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg?resize=300,159 300w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg?resize=277,147 277w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg?resize=359,190 359w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg?resize=543,288 543w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg?resize=560,297 560w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Cherry-Blossom-CPL.jpg?resize=150,79 150w\" sizes=\"auto, (max-width: 755px) 100vw, 755px\" \/><\/a><figcaption>The noise appears only in the sky.<\/figcaption><\/figure>\n\n\n\n<p>When zoomed in at 200%, we can see that the noise level is unacceptable for what should be a clean image.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg\" data-wpel-link=\"internal\"><img loading=\"lazy\" decoding=\"async\" width=\"755\" height=\"400\" src=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg\" alt=\"Digital Noise CPL\" class=\"wp-image-154243\" srcset=\"https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg 755w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg?resize=300,159 300w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg?resize=277,147 277w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg?resize=359,190 359w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg?resize=543,288 543w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg?resize=560,297 560w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Digital-Noise-CPL.jpg?resize=150,79 150w\" sizes=\"auto, (max-width: 755px) 100vw, 755px\" \/><\/a><figcaption><em>Zoomed in at 200%.<\/em><\/figcaption><\/figure>\n\n\n\n<p>Given that I\u2019m filming with standard settings and my metering is displaying balanced values, it\u2019s hard not to wonder if it\u2019s the circular polarizer filter causing the issue. After all, that\u2019s the only additional feature added to the camera when these issues weren\u2019t prevalent just a few weeks back.<\/p>\n\n\n\n<p>However, the filter is, after all, a filter. It shouldn\u2019t be the cause of what looks like a digital issue. Sure, if there was flaring or vignetting, we could point all fingers to the filter. But, for what is a sensor detriment, there&#8217;s something else going on. Let\u2019s have a look.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-a-camera-or-filter-issue\"><span id=\"a-camera-or-filter-issue\">A Camera or Filter Issue?<\/span><\/h3>\n\n\n\n<p>If you didn\u2019t have time to watch the video, let me quickly catch you up with how a polarizer filter works. The full write-up addresses all of this in more detail. For a more in-depth analysis, head on over to the <a href=\"https:\/\/www.shutterstock.com\/blog\/circular-polarizer-lens-tutorial?utm_source=YouTube&amp;utm_medium=Video&amp;utm_content=Learn-What-a-Circular-Polarizer-Does-with-this-Quick-Tutorial&amp;utm_campaign=04-2021-youtube-video\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"external\">Shutterstock blog post<\/a>.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>When the light comes from a direct source, like the sun, the light\u2014as in the waves of light\u2014are oscillating in different directions and unpolarized. However, when those waves hit a glossy surface, the reflective light only oscillates in one direction, and that direction is usually parallel to the reflecting surface.<\/p><p>These filters will reduce (not necessarily entirely remove) the reflections and glare by filtering the polarized light. For the most part, all we\u2019re receiving from the sensor is non-polarized light, which helps to reduce reflections and glare.<\/p><p>In blue skies, the sunlight is also being scattered and bounced around by the particles in our atmosphere. Therefore, on a particle level, you could say it\u2019s still being reflected. As a result, we\u2019ll see skies at a richer blue with the filter in effect.&nbsp;<\/p><cite>&#8211; Lewis McGregor, Freelance Filmmaker<\/cite><\/blockquote>\n\n\n\n<p>If the polarized light is being absorbed, does that mean we also see a reduction of light? Yes, as noted by <a href=\"https:\/\/ascmag.com\/blog\/shot-craft\/understanding-polarizing-filters#:~:text=Polarizing%20filters%20absorb%20about%2011,stops%20of%20light%2C%20on%20average.&amp;text=When%20shooting%20in%20sunlight%2C%20the,be%20uniform%20across%20the%20frame.\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"external\"><em>American Cinematographer Magazine<\/em><\/a>:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>The biggest liability when using a polarizer is loss of light. When we realize that the filter is absorbing the polarized light, it\u2019s easy to understand that the filter, therefore, requires a considerable exposure compensation. Polarizing filters absorb about 1.5 to 2 stops of light, on average.&nbsp;&nbsp;<\/p><cite>&#8211; <a href=\"https:\/\/ascmag.com\/blog\/author\/jayholben\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"external\">Jay Holben<\/a>, <em>American Cinematographer Magazine<\/em><\/cite><\/blockquote>\n\n\n\n<p>With that knowledge in check, we can now see a possible culprit. When we\u2019re not reducing glare from objects or removing reflections from shiny surfaces, we need to consider the loss of light and the exposure compensation needed.<\/p>\n\n\n\n<p>Let\u2019s look at this shot, for example.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg\" data-wpel-link=\"internal\"><img loading=\"lazy\" decoding=\"async\" width=\"755\" height=\"400\" src=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg\" alt=\"Washing Line CPL\" class=\"wp-image-154244\" srcset=\"https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg 755w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg?resize=300,159 300w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg?resize=277,147 277w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg?resize=359,190 359w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg?resize=543,288 543w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg?resize=560,297 560w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-CPL.jpg?resize=150,79 150w\" sizes=\"auto, (max-width: 755px) 100vw, 755px\" \/><\/a><figcaption><em>Before adjusting the midtones.<\/em><\/figcaption><\/figure>\n\n\n\n<p>It\u2019s a bright cloudless day. The wind is abrasive, with laundry on the washing line and a cherry blossom tree in the background\u2014perfect for a 120fps B-roll of both elements blowing in the wind. As the sky is a pale blue, it was the ideal opportunity to use the CPL and bring out that beautiful blue hidden by the polarization.<\/p>\n\n\n\n<p>I can see the trousers and towel are slightly too hot in Resolve upon applying the REC.709 LUT. This can be easily remedied by lowering the gain to bring those whites into safe values, then slightly boosting the midtones to compensate for that adjustment. However, now we can see noise appearing in the sky.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg\" data-wpel-link=\"internal\"><img loading=\"lazy\" decoding=\"async\" width=\"755\" height=\"400\" src=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg\" alt=\"Washing Line Balanced CPL\" class=\"wp-image-154245\" srcset=\"https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg 755w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg?resize=300,159 300w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg?resize=277,147 277w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg?resize=359,190 359w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg?resize=543,288 543w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg?resize=560,297 560w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL.jpg?resize=150,79 150w\" sizes=\"auto, (max-width: 755px) 100vw, 755px\" \/><\/a><figcaption><em>After adjusting the midtones.<\/em><\/figcaption><\/figure>\n\n\n\n<p>And, this is where it\u2019s essential to acknowledge the exposure compensation, which is something I didn\u2019t do. With the CPL affecting the sky so profoundly, what would effectively be metered as midtones\/highlights, is now being presented as midtones\/shadows.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg\" data-wpel-link=\"internal\"><img loading=\"lazy\" decoding=\"async\" width=\"755\" height=\"400\" src=\"https:\/\/www.premiumbeat.com\/blog\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg\" alt=\"Washing Line Balanced CPL\" class=\"wp-image-154246\" srcset=\"https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg 755w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg?resize=300,159 300w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg?resize=277,147 277w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg?resize=359,190 359w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg?resize=543,288 543w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg?resize=560,297 560w, https:\/\/vip-go.premiumbeat.com\/wp-content\/uploads\/2021\/05\/Washing-Line-Balanced-CPL-100.jpg?resize=150,79 150w\" sizes=\"auto, (max-width: 755px) 100vw, 755px\" \/><\/a><figcaption><em>Make sure to acknowledge the exposure compensation.<\/em><\/figcaption><\/figure>\n\n\n\n<p>When we adjust the midtones, the sky doesn&#8217;t simply receive a slight boost as its bright value. Instead we\u2019re now lifting the values quite significantly. And, because the atmosphere contributes to an overall large part of the composition, the noise is immediately noticeable. <\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-answer\"><span id=\"the-answer\">The Answer<\/span><\/h3>\n\n\n\n<p>Therefore, no, a circular polarizer filter doesn\u2019t cause digital noise. However, if you don&#8217;t compensate for the loss of light, you&#8217;ll need to raise the values in post-production. This will, in turn, then introduce noise. As suggested by <em>American Cinematographer Magazine<\/em>, you&#8217;ll need to compensate 1.5 to 2 stops to avoid this issue. <\/p>\n\n\n\n<p>However, in my example, given that some garments of the washing were already considerably hot in terms of tonal values, 1.5 to 2 stops compensation would have fully clipped those whites. CPL has a lot of value and I intend to continue using it often. But, not every shoot needs it, and not every camera needs it on the lens permanently. <\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>For more tips on filters, check out these articles:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.premiumbeat.com\/blog\/pros-cons-clear-uv-filters\/\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"internal\">Are Clear UV Filters a Pro or a Con for Expensive Lenses<\/a><\/li><li><a href=\"https:\/\/www.premiumbeat.com\/blog\/the-best-variable-nd-filters\/\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"internal\">Some of the Best and Most Affordable Variable ND Filters of 2020<\/a><\/li><li><a href=\"https:\/\/www.premiumbeat.com\/blog\/fix-variable-nd-filter-vignette-davinci-resolve\/\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"internal\">Learn How to Fix a Variable ND Filter Vignette in DaVinci Resolve<\/a><\/li><li><a href=\"https:\/\/www.premiumbeat.com\/blog\/world-diffusion-filters\/\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"internal\">The World of Diffusion Filters<\/a><\/li><li><a href=\"https:\/\/www.shutterstock.com\/blog\/guide-to-neutral-density-filters\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"external\">Everything You Need to Know About Neutral Density Filters<\/a><\/li><\/ul>\n\n\n\n<p><em>Cover image by <a href=\"https:\/\/www.shutterstock.com\/image-photo\/polarizing-filter-camera-1079158259\" target=\"_blank\" rel=\"noreferrer noopener\" data-wpel-link=\"external\">darksoul72<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In today&#8217;s discussion, we&#8217;re exploring the reasons behind digital noise, and whether or not the circular polarized filter is the culprit.<\/p>\n","protected":false},"author":72,"featured_media":154247,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4519,5340,583],"tags":[1273,2703,6616,206,2345,6213,2359,3696],"class_list":["post-class-post-154165","post-class-post","post-class-type-post","post-class-status-publish","post-class-format-standard","post-class-has-post-thumbnail","post-class-hentry","post-class-category-cinematography-2","post-class-category-video-gear","post-class-category-video-production-2","post-class-tag-camera-lens","post-class-tag-camera-lenses","post-class-tag-clp","post-class-tag-filters","post-class-tag-lens","post-class-tag-lens-filters","post-class-tag-lenses","post-class-tag-polarizer"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Does the Circular Polarizer Filter Cause Digital Noise?<\/title>\n<meta name=\"description\" content=\"In today&#039;s discussion, we&#039;re exploring the reasons behind digital noise, and whether or not the circular polarized filter is the culprit.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.premiumbeat.com\/blog\/circular-polarizer-filter-digital-noise\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Does the Circular Polarizer Filter Cause Digital Noise?\" \/>\n<meta property=\"og:description\" content=\"In today&#039;s discussion, we&#039;re exploring the reasons behind digital noise, and whether or not the circular 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