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iso跟光圈大小的差異
deepseadoll
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6-30-2007 3:27 AM
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/4ac7e796-9d44-40f9-907b-2a93868bceb0/74526E83-ED1D-4B65-9423-012F56E6A2DF/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.eyny.com/thread-405044-1-4.html" href="http://www.eyny.com/thread-405044-1-4.html" style="font-size: 11px;">www.eyny.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.eyny.com/thread-405044-1-4.html"><DIV>ISO 是感光元件 (以往是指底片)的「感光度」,ISO值愈高,同樣場景下的所需曝光時間愈短。 而「光圈」是鏡頭本身的進光量,所以光圈愈大,同樣場景下的所需曝光時間也愈短。 (請注意「光圈值」要用「倒數」來看,例如 F2的光圈就比 F8大多了,因為 "1/2 > 1/8") 但是這兩個不是一樣的東西, 拍攝時的調整也會造成照片的不同。 大光圈會造成淺景深,也就是不在對焦平面上的物件容易模糊, 也就是一般說的「散景」。 所以相同曝光時間,一張用小光圈加上高ISO,另一張用大光圈加小ISO, 可能對焦平面的影象一樣,而背景的能見度就不同了。 一般要凸顯主題會用大光圈照單一物體,<BR /><DIV> 而「團體照」之類的照片就會用小光圈,以免站得前前後後的人糊掉。</DIV> 快門的快與慢就是感光元件受光的時間。 一般而言,光線足的話,最好快門時間短一些,以免手震造成照片模糊, 但要照特殊效果(如夜拍的「光跡」)時也會故意用長時間曝光。<BR /><DIV> 通常要長時間曝光就要上腳架以免手震。</DIV> 千萬畫素的相機可以確定的是「儲存的檔案有千萬畫素」, 但不能保證你放到100%來看時是不是每個畫素都「粒粒皆清楚」, 一般來說,隨身型DC的千萬畫素是比不上DSLR的六百萬畫素的。 事實上,以4X6的相片輸出而言,200萬~300萬畫素已足夠。(因人眼能辨識的解析度約300dpi) 所以,如果沒特殊需求,只是一般要洗成4X6的照片, 就不用去追求高畫素了~~ 用不到,又佔記憶卡容量! </DIV></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/74526E83-ED1D-4B65-9423-012F56E6A2DF/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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