<form id="nzids"><legend id="nzids"><video id="nzids"></video></legend></form>
    1. <nobr id="nzids"><progress id="nzids"><big id="nzids"></big></progress></nobr>
      1. <sub id="nzids"><address id="nzids"></address></sub>

        <form id="nzids"></form><nav id="nzids"></nav>

        <nav id="nzids"><address id="nzids"><meter id="nzids"></meter></address></nav>

      2. <nav id="nzids"></nav>

      3. <nav id="nzids"></nav>

        <em id="nzids"><source id="nzids"><option id="nzids"></option></source></em>
        <wbr id="nzids"><pre id="nzids"></pre></wbr>
        <form id="nzids"></form>

        <form id="nzids"><span id="nzids"><option id="nzids"></option></span></form><form id="nzids"></form>

          <form id="nzids"></form>

            <wbr id="nzids"></wbr>
          1. <big id="nzids"></big>

                <sub id="nzids"></sub>
                <nav id="nzids"></nav>
              1. <form id="nzids"></form>
                <sub id="nzids"></sub>
                <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>
                <sub id="nzids"></sub>
                
                

                <em id="nzids"></em>

                  <wbr id="nzids"><legend id="nzids"></legend></wbr>
                1. <form id="nzids"></form>
                2. <sub id="nzids"></sub><form id="nzids"><span id="nzids"><track id="nzids"></track></span></form>

                  <sub id="nzids"></sub>
                  <nav id="nzids"><listing id="nzids"></listing></nav>

                    <form id="nzids"></form>
                    <sub id="nzids"><address id="nzids"><nobr id="nzids"></nobr></address></sub>

                    <nav id="nzids"></nav>
                    <nav id="nzids"></nav>
                      <form id="nzids"><source id="nzids"><option id="nzids"></option></source></form>
                      <sub id="nzids"></sub>

                    1. 
                      

                    2. <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>

                      <nav id="nzids"></nav>

                      <nav id="nzids"></nav><form id="nzids"><th id="nzids"><big id="nzids"></big></th></form>

                            <nav id="nzids"></nav>
                            <nav id="nzids"></nav>
                            <form id="nzids"><legend id="nzids"><video id="nzids"></video></legend></form>

                                  <form id="nzids"></form>
                                  <nav id="nzids"></nav><sub id="nzids"><address id="nzids"></address></sub>
                                  <wbr id="nzids"><legend id="nzids"></legend></wbr>
                                  <sub id="nzids"><address id="nzids"></address></sub>
                                    1. <wbr id="nzids"></wbr>

                                        <nav id="nzids"><listing id="nzids"></listing></nav>
                                          <nav id="nzids"></nav>
                                            <form id="nzids"></form>

                                            <sub id="nzids"></sub>
                                              <sub id="nzids"><listing id="nzids"></listing></sub>

                                              <em id="nzids"><span id="nzids"></span></em>
                                              <tr id="nzids"></tr><form id="nzids"></form>

                                              
                                              
                                            1. <em id="nzids"></em>
                                              <big id="nzids"><listing id="nzids"></listing></big>
                                              <tr id="nzids"><span id="nzids"></span></tr>
                                              <form id="nzids"></form>
                                              <nav id="nzids"></nav>

                                                1. <sub id="nzids"></sub>
                                                  <sub id="nzids"></sub>

                                                    <sub id="nzids"></sub>

                                                    <bdo id="nzids"><th id="nzids"><noscript id="nzids"></noscript></th></bdo>
                                                    1. <form id="nzids"></form>
                                                      <nav id="nzids"><code id="nzids"></code></nav>
                                                      1. <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>
                                                      2. <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>
                                                          <sub id="nzids"></sub>
                                                            <nobr id="nzids"></nobr>

                                                          1. <nav id="nzids"></nav>
                                                            <form id="nzids"></form>
                                                            <form id="nzids"></form>

                                                              1. <sub id="nzids"></sub>
                                                                <em id="nzids"><span id="nzids"></span></em>

                                                                <form id="nzids"><span id="nzids"><track id="nzids"></track></span></form>

                                                                <form id="nzids"></form>

                                                                <nav id="nzids"></nav>
                                                                <nav id="nzids"></nav>

                                                                <sub id="nzids"><address id="nzids"></address></sub>
                                                                    <em id="nzids"></em>

                                                                      <nav id="nzids"></nav>

                                                                      <wbr id="nzids"><pre id="nzids"><video id="nzids"></video></pre></wbr>
                                                                      <form id="nzids"><span id="nzids"></span></form>

                                                                      1. <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>

                                                                        <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>
                                                                        <nav id="nzids"><listing id="nzids"></listing></nav>

                                                                          <wbr id="nzids"><legend id="nzids"></legend></wbr>

                                                                        1. <sub id="nzids"></sub>
                                                                          <sub id="nzids"><address id="nzids"><div id="nzids"></div></address></sub>

                                                                        2. <form id="nzids"><span id="nzids"><track id="nzids"></track></span></form><wbr id="nzids"></wbr>

                                                                            <form id="nzids"></form><form id="nzids"></form>

                                                                          1. <nobr id="nzids"><th id="nzids"></th></nobr>

                                                                                  <wbr id="nzids"></wbr>

                                                                                  1. <form id="nzids"></form>

                                                                                    <var id="nzids"></var>

                                                                                    <em id="nzids"></em>
                                                                                    <sub id="nzids"></sub>

                                                                                    <nav id="nzids"></nav>

                                                                                    <sub id="nzids"><listing id="nzids"></listing></sub><form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>

                                                                                      <table id="nzids"></table>
                                                                                      <nav id="nzids"><address id="nzids"></address></nav>
                                                                                      <wbr id="nzids"></wbr>
                                                                                        1. 
                                                                                          

                                                                                            1. <wbr id="nzids"><legend id="nzids"></legend></wbr>
                                                                                              1. <nav id="nzids"></nav>

                                                                                                      <sub id="nzids"></sub><form id="nzids"></form>

                                                                                                    1. <form id="nzids"></form>
                                                                                                      <sub id="nzids"></sub>
                                                                                                      <form id="nzids"><span id="nzids"><track id="nzids"></track></span></form>
                                                                                                    2. <form id="nzids"><span id="nzids"><track id="nzids"></track></span></form>
                                                                                                      1. <form id="nzids"></form>
                                                                                                        <nav id="nzids"></nav>
                                                                                                        <form id="nzids"></form>
                                                                                                        <form id="nzids"><legend id="nzids"><noscript id="nzids"></noscript></legend></form>
                                                                                                        1. <em id="nzids"><source id="nzids"></source></em>
                                                                                                          <form id="nzids"><span id="nzids"><track id="nzids"></track></span></form>
                                                                                                          <nav id="nzids"></nav>

                                                                                                              <form id="nzids"><legend id="nzids"></legend></form>

                                                                                                                1. <form id="nzids"></form>

                                                                                                                    <form id="nzids"></form>
                                                                                                                    <meter id="nzids"><tt id="nzids"><mark id="nzids"></mark></tt></meter>

                                                                                                                        <wbr id="nzids"></wbr>
                                                                                                                          <nav id="nzids"></nav>
                                                                                                                          <nav id="nzids"><listing id="nzids"><meter id="nzids"></meter></listing></nav>
                                                                                                                              <wbr id="nzids"><legend id="nzids"></legend></wbr>

                                                                                                                              1. <nav id="nzids"><listing id="nzids"><nobr id="nzids"></nobr></listing></nav>
                                                                                                                                <em id="nzids"></em>
                                                                                                                                <wbr id="nzids"><legend id="nzids"></legend></wbr>
                                                                                                                                <sub id="nzids"><address id="nzids"></address></sub>
                                                                                                                                <form id="nzids"><span id="nzids"></span></form>

                                                                                                                                    <em id="nzids"><span id="nzids"></span></em>
                                                                                                                                      1. <form id="nzids"></form>

                                                                                                                                          <sub id="nzids"></sub>
                                                                                                                                              1. <sub id="nzids"><listing id="nzids"><meter id="nzids"></meter></listing></sub>

                                                                                                                                                    <wbr id="nzids"></wbr>

                                                                                                                                                      <sub id="nzids"><listing id="nzids"><nobr id="nzids"></nobr></listing></sub>
                                                                                                                                                      <form id="nzids"><source id="nzids"><option id="nzids"></option></source></form>
                                                                                                                                                    1. <wbr id="nzids"></wbr>

                                                                                                                                                            <form id="nzids"></form>
                                                                                                                                                            <nobr id="nzids"><progress id="nzids"><big id="nzids"></big></progress></nobr><form id="nzids"><legend id="nzids"></legend></form>

                                                                                                                                                            <sub id="nzids"><td id="nzids"></td></sub>
                                                                                                                                                            <form id="nzids"><span id="nzids"><big id="nzids"></big></span></form>

                                                                                                                                                            <sub id="nzids"></sub><nav id="nzids"></nav>
                                                                                                                                                                <bdo id="nzids"><th id="nzids"><sub id="nzids"></sub></th></bdo>

                                                                                                                                                                  <em id="nzids"></em>
                                                                                                                                                                  <sub id="nzids"></sub>
                                                                                                                                                                  <wbr id="nzids"></wbr><wbr id="nzids"></wbr><form id="nzids"></form>
                                                                                                                                                                    1. <sub id="nzids"><listing id="nzids"></listing></sub>

                                                                                                                                                                        <em id="nzids"><span id="nzids"></span></em><form id="nzids"></form>

                                                                                                                                                                              <em id="nzids"><span id="nzids"></span></em>

                                                                                                                                                                              <bdo id="nzids"><th id="nzids"><big id="nzids"></big></th></bdo>

                                                                                                                                                                                <em id="nzids"><span id="nzids"></span></em>
                                                                                                                                                                              1. <nav id="nzids"><listing id="nzids"><meter id="nzids"></meter></listing></nav>

                                                                                                                                                                                  <nav id="nzids"><listing id="nzids"><meter id="nzids"></meter></listing></nav><form id="nzids"><span id="nzids"><track id="nzids"></track></span></form>
                                                                                                                                                                                1. <wbr id="nzids"></wbr>

                                                                                                                                                                                  <form id="nzids"></form>
                                                                                                                                                                                  <form id="nzids"></form>
                                                                                                                                                                                  <nobr id="nzids"><th id="nzids"><sub id="nzids"></sub></th></nobr>
                                                                                                                                                                                  <form id="nzids"><th id="nzids"><track id="nzids"></track></th></form>

                                                                                                                                                                                2. <em id="nzids"></em>

                                                                                                                                                                                  <em id="nzids"></em>
                                                                                                                                                                                  北創高清鏡頭,大量批發

                                                                                                                                                                                  熱門關鍵詞:工業鏡頭,手機鏡頭,安防鏡頭,鏡片加工,檢測儀器

                                                                                                                                                                                  您的位置: 首頁 > 新聞咨詢 > 常見問題

                                                                                                                                                                                  北創光電為您解讀焦距

                                                                                                                                                                                  作者: 編輯: 發布日期:2018年08月20日 09:09:44
                                                                                                                                                                                  信息摘要:
                                                                                                                                                                                  焦距不僅決定了這支鏡頭的視角,還決定了被攝體的放大倍率。焦距以毫米來表示,數值越小說明焦距越短,視角越大;數值越大則說明焦距越長,視角越小。另外,焦距的長度還會影響透視效果?!?/div>

                                                                                                                                                                                          焦距不僅決定了這支鏡頭的視角,還決定了被攝體的放大倍率。焦距以毫米來表示,數值越小說明焦距越短,視角越大;數值越大則說明焦距越長,視角越小。另外,焦距的長度還會影響透視效果。

                                                                                                                                                                                  一、焦距概念:

                                                                                                                                                                                  焦距是光學系統中衡量光線聚集或發散的度量方式。平行的光線進入對焦在無窮遠的鏡頭后,它們匯聚到一點,這個點叫做焦點。簡單來說,焦距長度是指從透鏡的光心到焦點的距離。為了能夠對焦到比無限遠近一些的被攝體上,鏡頭要調節至距焦平面更遠的位置。這就是很多鏡頭在轉動對焦環時鏡頭長度會增大的原因。

                                                                                                                                                                                  二、鏡頭按焦距大小的分類:

                                                                                                                                                                                  攝影鏡頭數量龐大,從魚眼鏡頭到長達1000毫米的超遠攝鏡頭。我們通常把它們分為廣角鏡頭、標準鏡頭和遠攝鏡頭。人類的視角大體上相當于50毫米焦距的視角,所以焦距在35-50毫米的鏡頭都被看作標準鏡頭。小于這個焦距的為廣角鏡頭,大于的則為遠攝鏡頭。

                                                                                                                                                                                  三、焦距對成像的影響:

                                                                                                                                                                                  距離被攝體距離相同的情況下,長焦距鏡頭比短焦距鏡頭拍攝的畫面中,被攝體的所占比例要大。相同的被攝體距離,焦距長度增加一倍會讓被攝體在畫面中的大小也增大一倍?;蛘?保持焦距長度不變,減少被攝體到相機的距離到一半,也會讓被攝體在畫面中的大小增加一倍。

                                                                                                                                                                                        許多數碼單反相機的影像傳感器的面積都小于傳統的35毫米相機標準,就變相地增大了鏡頭的焦距。想要達到相同的視角則需要更短焦距的鏡頭。這就是在提及很多數碼單反鏡頭的焦距時,要換算成傳統135單反相機的等效焦距的原因。

                                                                                                                                                                                  四、鏡頭小貼士:

                                                                                                                                                                                  鏡頭的焦距長度同時也對如何能手持相機拍攝出清晰銳利的影像有重要影響。使用長焦距鏡頭拍攝時需要更快的快門速度去避免模糊,這種模糊通常是由攝影者自然抖動導致的。

                                                                                                                                                                                  全國服務熱線

                                                                                                                                                                                  158-1368-4131
                                                                                                                                                                                  韩国三级在线观看久,欧美肥婆丰满bbw,上课停电趴开校花内裤,黄网站色视频网站免费 <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <文本链> <文本链> <文本链> <文本链> <文本链> <文本链>