{"id":83683,"date":"2026-07-15T10:00:00","date_gmt":"2026-07-15T07:00:00","guid":{"rendered":"https:\/\/optikwelt.ee\/ostujuhendid-ja-vordlused\/netd-alla-20-mk-25-mk-voi-40-mk-kas-jahimees-naeb-tegelikult-vahet\/"},"modified":"2026-09-29T12:35:51","modified_gmt":"2026-09-29T09:35:51","slug":"netd-alla-20-mk-25-mk-voi-40-mk-kas-jahimees-naeb-tegelikult-vahet","status":"publish","type":"post","link":"https:\/\/optikwelt.ee\/en\/ostujuhendid-ja-vordlused\/netd-alla-20-mk-25-mk-voi-40-mk-kas-jahimees-naeb-tegelikult-vahet\/","title":{"rendered":"NETD below 20 mK, 25 mK or 40 mK \u2013 does the hunter really see a difference?"},"content":{"rendered":"<p>When you start comparing modern thermal cameras, you quickly notice one figure that manufacturers almost always emphasise.<\/p>\n<p>NETD.<\/p>\n<p>Some models state below 40 mK.<\/p>\n<p>Others below 25 mK.<\/p>\n<p>The newest and most expensive devices even below 20 mK.<\/p>\n<p>But what does that actually mean?<\/p>\n<p>Does the hunter notice the difference in the forest, or is it just marketing?<\/p>\n<p>The answer is simple.<\/p>\n<p>Yes, they do.<\/p>\n<p>But not always where most buyers expect.<\/p>\n<h2>What is NETD?<\/h2>\n<p>NETD (Noise Equivalent Temperature Difference) shows how small temperature differences the thermal camera's sensor can distinguish.<\/p>\n<p>Put simply:<\/p>\n<p>the lower the NETD number, the more sensitive the sensor.<\/p>\n<p>And the more sensitive the sensor, the more detail you see.<\/p>\n<p>For example:<\/p>\n<p>A 40 mK sensor sees strong temperature contrasts well.<\/p>\n<p>A 25 mK sensor sees more small details.<\/p>\n<p>A 20 mK sensor sees even finer differences.<\/p>\n<p>On paper the difference seems small.<\/p>\n<p>In practice it can change the whole observation experience.<\/p>\n<h2>When does NETD not play a big role?<\/h2>\n<p>Let us imagine a cold January evening.<\/p>\n<p>The air temperature is \u201310 \u00b0C.<\/p>\n<p>A wild boar is crossing a snowy field.<\/p>\n<p>In such a situation the animal stands out very well with almost any quality thermal camera.<\/p>\n<p>The temperature difference between the animal and the background is large.<\/p>\n<p>The contrast is strong.<\/p>\n<p>In such ideal conditions the average hunter may not notice much difference between a 40 mK and a 20 mK sensor.<\/p>\n<p>Many buyers make a mistake here.<\/p>\n<p>They try the devices in ideal conditions and conclude that they all perform the same.<\/p>\n<h2>Estonian weather is not ideal<\/h2>\n<p>In reality, most hunting takes place in much more difficult conditions.<\/p>\n<p>Autumn.<\/p>\n<p>Rain.<\/p>\n<p>Fog.<\/p>\n<p>Damp forest.<\/p>\n<p>Thaw.<\/p>\n<p>Wet ground.<\/p>\n<p>This is where NETD really gets to work.<\/p>\n<p>The smaller the temperature difference between the animal and its surroundings, the harder it is for the animal to stand out from the background.<\/p>\n<p>In such situations a better sensor shows more detail.<\/p>\n<p>And this difference is often very clearly visible.<\/p>\n<h2>40 mK vs 25 mK \u2013 what does the hunter see?<\/h2>\n<p>At 300 metres both devices may show the animal.<\/p>\n<p>But the difference is in the details.<\/p>\n<p>40 mK sensor:<\/p>\n<ul>\n<li>the animal is visible<\/li>\n<li>the silhouette is there<\/li>\n<\/ul>\n<p>less detail.<\/p>\n<p>25 mK sensor:<\/p>\n<ul>\n<li>body outlines are clearer<\/li>\n<li>the legs stand out better<\/li>\n<li>the shape of the head is more visible<\/li>\n<\/ul>\n<p>movement is easier to assess.<\/p>\n<p>This means the animal is not just a warm dot.<\/p>\n<p>It becomes a more recognisable object.<\/p>\n<h2>25 mK vs 20 mK \u2013 is there a difference?<\/h2>\n<p>Yes.<\/p>\n<p>But it is smaller than the difference between 40 mK and 25 mK.<\/p>\n<p>A 20 mK sensor becomes especially valuable:<\/p>\n<ul>\n<li>in rain<\/li>\n<li>in fog<\/li>\n<li>in damp forest<\/li>\n<li>early in the morning<\/li>\n<li>on an autumn field<\/li>\n<\/ul>\n<p>in difficult temperature conditions.<\/p>\n<p>These are situations where even small details can help make the right decision.<\/p>\n<h2>Does NETD affect the detection range?<\/h2>\n<p>Not directly.<\/p>\n<p>A mistake is often made here.<\/p>\n<p>The detection range is mainly affected by:<\/p>\n<ul>\n<li>lens size<\/li>\n<li>sensor resolution<\/li>\n<\/ul>\n<p>optical quality.<\/p>\n<p>NETD primarily affects how much detail you see.<\/p>\n<p>You may spot the animal with both devices.<\/p>\n<p>But a device with lower NETD helps you better understand what you are actually looking at.<\/p>\n<h2>Why do professional hunters talk about NETD so much?<\/h2>\n<p>Because experience teaches.<\/p>\n<p>Over the years it becomes clear that most hunts do not take place in ideal conditions.<\/p>\n<p>True quality shows when:<\/p>\n<ul>\n<li>it is raining<\/li>\n<li>fog drifts across the field<\/li>\n<li>the forest is wet<\/li>\n<\/ul>\n<p>the air temperature is close to zero.<\/p>\n<p>That is when the better sensor starts to give an advantage.<\/p>\n<p>This does not necessarily mean more visible animals.<\/p>\n<p>It means more visible detail.<\/p>\n<p>And detail helps you make better decisions.<\/p>\n<h2>Higher resolution or better NETD?<\/h2>\n<p>This is one of the most popular questions.<\/p>\n<p>If you compare:<\/p>\n<ul>\n<li>640\u00d7480 sensor + 40 mK<\/li>\n<li>and<\/li>\n<li>384\u00d7288 sensor + below 20 mK<\/li>\n<\/ul>\n<p>then the answer is not always simple.<\/p>\n<p>Both features are important.<\/p>\n<p>Ideally the hunter should get:<\/p>\n<ul>\n<li>high resolution<\/li>\n<li>a low NETD value<\/li>\n<\/ul>\n<p>quality optics.<\/p>\n<p>These three features work together.<\/p>\n<p>Deciding on the basis of just one figure can be misleading.<\/p>\n<h2>Which NETD values are good in 2026?<\/h2>\n<h3>Below 40 mK<\/h3>\n<p>A good average level.<\/p>\n<p>Suits many hunters.<\/p>\n<h3>Below 25 mK<\/h3>\n<p>A very good level.<\/p>\n<p>Offers noticeably more detail in difficult conditions.<\/p>\n<h3>Below 20 mK<\/h3>\n<p>Top level.<\/p>\n<p>Maximum sensitivity and richness of detail.<\/p>\n<p>Suits the demanding user.<\/p>\n<h2>Is a thermal camera with higher NETD bad?<\/h2>\n<p>Certainly not.<\/p>\n<p>Many successful hunters use devices with NETD below 40 mK.<\/p>\n<p>It is important to understand that hunting success does not depend on a single number.<\/p>\n<p>Experience, observation skills and correct use always remain the most important.<\/p>\n<p>NETD simply helps you see more.<\/p>\n<h2>Summary<\/h2>\n<p>If you hunt mainly in ideal conditions, the difference may not seem very big.<\/p>\n<p>But if you spend a lot of time in the forest, on fields and in changeable weather, low NETD quickly becomes one of the most important features.<\/p>\n<p>40 mK helps you spot the animal.<\/p>\n<p>25 mK helps you assess the animal better.<\/p>\n<p>20 mK helps you see detail even when the weather is working against you.<\/p>\n<p>That is why NETD should not be seen as just a technical number.<\/p>\n<p>It is one of the main reasons why two similar-looking thermal cameras can give completely different results in the forest.<\/p>\n<p>A good thermal camera does not just show heat.<\/p>\n<p>A good thermal camera shows the details that help the hunter make the right decision at the right moment.<\/p>","protected":false},"excerpt":{"rendered":"<p>When you start comparing modern thermal cameras, you quickly notice one figure that manufacturers almost always emphasise.<\/p>","protected":false},"author":116,"featured_media":520,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"NETD alla 20 mK, 25 mK v\u00f5i 40 mK \u2013 kas jahimees n\u00e4eb tegelikult vahet? - Optikwelt","_seopress_titles_desc":"Kui hakkate v\u00f5rdlema kaasaegseid termokaameraid, m\u00e4rkate kiiresti \u00fchte n\u00e4itajat, mida tootjad r\u00f5hutavad peaaegu 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