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本帖最后由 mhtl 于 2020-4-17 10:06 编辑 <br /><br /><p class="MsoNormal"><span style="font-family: 宋体;">这台</span><span lang="EN-US">T3</span><span style="font-family: 宋体;">成色挺好，但啥动作都没有。拆开检查，里面无任何肉眼看得到的故障，基本可以放弃治疗，送肢解中心。</span></p>
<p class="MsoNormal"><span lang="EN-US">YASHICA T</span><span style="font-family:
宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin">系列的镜头都是</span><span lang="EN-US">carl zeiss
tessar </span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">系列，也就是通常所说的日蔡。虽然不是德国产蔡司，但镜头质量以及成像还是可圈可点的，以前曾经将</span><span lang="EN-US">YASHICA T AF-D</span><span style="font-family:宋体;mso-ascii-font-family:
Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">的</span><span lang="EN-US">35/3.5tessar</span><span style="font-family:宋体;mso-ascii-font-family:
Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">改成</span><span lang="EN-US">SONY</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">的</span><span lang="EN-US">E</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">口，在</span><span lang="EN-US">A7</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">上感觉非常棒。</span></p>
<p class="MsoNormal"><span lang="EN-US">T3</span><span style="font-family:宋体;
mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin">这个</span><span lang="EN-US">35/2.8tessar</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:
Calibri;mso-hansi-theme-font:minor-latin">由于后面有一片巨大的凹透镜，且独立于前镜头，改装的难度就比</span><span lang="EN-US">T AF-D</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">的大多了。不过，这么好的镜头总不能把它扔了吧？最终，我还是决定把它改成</span><span lang="EN-US">E</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">口。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">将镜头拆下来后发现，最后一片树脂镜片是固定在一个方形的基座上的，遂先将该基座车成圆形，这道关相当难过，由于镜头座是塑料的，且镜片是树脂片，都是非常脆弱的东西。无比小心加工后终于得到完整的带基座的后镜片。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">接下来加工前镜组，铣床铣掉多余的支架后，也得到一枚圆形的镜组。由于该镜组直径非常小，无法固定在我将要种镜的镜头中，遂用铜材加工了一个套筒，将镜组装进去。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">完成上述工序后，实际上整个改镜就已经成功了一半。剩下就是加工母镜头的后口等工作。为了这枚可能很牛逼的镜头，我甚至花了点时间将整个镜头全部拆开洗干净重新组装。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">总装还是很快的，一大堆配件不到半小时就装好，最后一道也是最关键的工序是装镜组。前组不难，借用原镜头的压圈等就可以搞定，后组就麻烦得很了！首先是如何固定，其次是保证同轴度，这个在没有仪器校准的情况下基本靠感觉，此处就不赘述了。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">最后，给这镜头设计了一个前压圈的标签，打印出来贴在前面，还挺像那回事。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">试镜前来说说改这类后面有一片“鼓眼”的傻瓜机镜头。有人说这片“鼓眼”只是保护镜片的，可有可无，那是大错特错！这枚“鼓眼”是一片凹透镜，具体作用是延长前组的焦距同时也有消除暗角的功能，这是我根据它的实际作用来定义的。而厂家为什么这样设计，我不得而知，更不明白为什么所有厂家的这片镜片都采用树脂片，树脂片虽然很容易加工成非球面等形状，但却很容易划伤！如果不要这片“鼓眼”，单独的前组一样可以成像，但是焦距会变短，同时像距也会缩短很多，至于成像质量有多大影响，我就没有去深究了。</span></p>
<p class="MsoNormal"><span lang="EN-US">Ok</span><span style="font-family:宋体;
mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin">，过程说完，原理讲尽，还是来看看样片吧。</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">三个字：“还可以”！</span></p><p></p> |
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发表于 2020-4-17 10:01
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