品相第一。 尤其是产量大的品种。

换个角度。

上海照相机三厂生产的制作精良的放大头。配前后金属镜头盖。很少见。估计是高档放大镜头。

嘿嘿。。。。

蔡司 50/1.6光刻头的结构。记得上照三厂的那只50/1.8 吗。体积，重量都很像啊。

非常新的一只苏联产旁轴拉脖头。也许将来也会像硬币，古董手表一样，品相对收藏价格起决定作用？

请朋友帮助鉴定一下这是什么目镜？

一组CZJ 无穷远矫正物镜。M19螺口。

看看一些特殊的国产显微镜物镜，正负相差，偏光，平场。

感觉Meopta的旁轴镜头质量优良。可惜是M38螺口的。转接环不容易配。那只45/2 Openar 相当少见。此头多年前购自马景孟老先生。他对此头赞不绝口。好多年没见老先生了。 本帖最后由 Kievuser 于 2016-3-10 21:10 编辑

几只C口电影摄影镜头。大部分是16毫米甚至8毫米的业余电影机用的。焦距长的可以用在微单上。

最近看到不少玩Meopta 镜头转接的。也亮亮我收到的Meopta镜头。捷克的放大头很不错。

指的是S-Planar（S-普兰那）, 就像天塞，松那等是某种镜头结构的称呼。蔡司给哈苏，康泰时配套的镜头有几只用这个称谓。好像是双高斯类对称结构的镜头。

k兄：那S-Pl标记是指啥意思？

The-S-Planar 25mm f / 1.6 was produced from 1974 to 1980, so it does not belongs to this generation of extreme lenses, assembled with more than 30 quartz and fluorite elements and that cost hundreds of thousands dollars each; however, it is very interesting because, in this sprint towards the theoretical extreme resolution, represents one of the first cases in which it was abandoned the visible light in order to exploit the ultraviolet; in particular, this objective was provided in three different versions, characterized by the inner production codes 10 77 37, 10 77 38 and 10 77 39: the first was optimized for a wavelength of 4800A° (F' line, cadmium blue line), the second to 4360A° (g line, blue mercury line) and the third, the most extreme and identical to the one shown here, worked at 4050A° (h line, violet mercury line), that is already into the utraviolet light, invisible to naked eyes.

The combination of the aperture f/1,6 with a special, "diffraction limited" optical formula, virtually perfect, and these working wavelengths entailed a maximum theoretical resolution, respectively, of about 1.300, about 1.430 and about 1.540 lines/mm, breathtaking values and almost unbelievable.

The objective in question was optimized for an 1:10 reproduction ratio, so it focused a mask, with the final model of the microchip, 10 times larger than the actual size and produced with a resolving power of 150 l/mm, projecting it's shape on the silicon wafer with a 10 times reduction and a resolving power, which is necessary to keep all the details of the scheme, up to 1.500 l/mm.

窥一斑而见全豹。 网上资料。蔡司1974年开发的光刻头。其中这款4360A h线紫外光刻头分辨率达到1,500 l/mm! 本帖最后由 Kievuser 于 2016-3-8 19:21 编辑

欢迎亮宝，本帖这方面还真没有。我有一把瑞士军刀。还有一套瑞士改锥。那钢可真不错。

呵呵。。。近几年喜欢研究一些“顶级” 镜头。发现一些‘改开派’造不如买的蛛丝马迹啊。

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都是好宝贝！男人嘛应该喜欢金属的东东

一只徕兹的不常见的显微镜物镜。

这可是挺稀罕的东西啊。

这个应该算精密仪器了吧？新收的莱卡PRADO66幻灯机。

这只早期起点牌相机的标头的款式非常稀有。目前全网还没有发现第二只。

有人开始研究苏联旁轴镜头的版本了。或许将来也是物以稀为贵啊。可惜当年并没有特别关注镜头。

只要漂亮，有趣，不精密也行啊。

是全金属全手动啊