M42近摄环,昆虫

昨天上午,收到从ebay.de上拍到的镜头。主要是买一个Pentacon 2.8/29,M42转接PK接口给自己的Pentax *ist DS。结果卖家的是一台Pratica PL nova-1,带着两个镜头(CZJ Tessar 2.8/50和Pentacon 2.8/29),都是以前东德生产的M42手动头。附带有一个测光计,还有三个近摄环。于是下午带着它们出去莱茵河堤坝上试镜头。

由于是加了近摄环成了微距,清晰的焦距范围特别窄,只有几个毫米的距离(可以看下面的照片,缩小光圈也不能明显增加景深)。需要非常接近拍摄物体,大概10cm以内。蹲在草地里找昆虫,拍起来需要"脚动对焦"。几十分钟下来,大汗淋漓。竟然拍到大量"不雅照"。

"集体照"以外,还有单个的肖像照,如下:

大部分的照片都是使用CZJ Tessar 2.8/50拍摄的,原来是一个不是特别注意的镜头。看来所谓参数,也并能够完全反应镜头质量。

想找找关于近摄环的资料,看看是不是有相关的换算参数。例如,将3个近摄环放在Pentacon 2.8/135上,实际上只是缩短了最近拍摄距离,从原来的1.7m缩至1m左右。而对于50和29两个焦段,却有明显的近摄效果。

另外,也可以看出几十年前手动镜头的分辨率,明显好于DA镜头,基本上可以放大至CCD的极限。几张蜻蜓和苍蝇的照片,都可以看清复眼的表面结构。毕竟以前的胶片机器对于镜头的要求,一点都不低于数码机身。如果有更高象素的机身(*ist DS,仅6百万象素),相信可以达到更好的效果。

6 Comments »

  1. tracy shu Said,

    29 6 月, 2008 @ 14:54

    偶就是很喜欢微距的背景虚化后的色彩  真是P~i~ao~~~Liang~~~~
  2. tracy shu Said,

    30 6 月, 2008 @ 14:54

    再来review一遍。。。
    尤喜“不雅照” 咔咔~~~
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    1 7 月, 2008 @ 14:54

    你也要抓紧啊!我等着升级了~~
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