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随笔
Discourse on Viewfinder Systems and Focusing Precision in SLR Cameras
The Evolution of SLR Focusing Mechanisms In the early days of the SLR camera, its parallax-free viewfinder experience won the hearts of many photographers. The sharpness of the image on the focus screen directly indicated focus accuracy. Yet, anyone who has handled vintage cameras knows the struggle: judging focus on a ground glass screen is notoriously difficult. Developing a precise focusing system became a long-standing challenge for every manufacturer. The classic focusing screen—with its central split-image prism, surrounding microprism collar, and outer matte field—became the gold standard for manual-focus SLRs. Yet the early evolution of these screens was anything but straightforward. Some camera designers sought to improve focus clarity by increasing viewfinder magnification. But higher magnification required shorter eyepiece focal…
Elevan2025年8月24日
产品&设计
3D打印的69片夹
因为有群友要求做这个,我就做了,按照标准69尺寸制作的内框,参考了马田67的外框尺寸(85mm、70mm)进行设计,方便适配幻灯机。 设计细节 采用4条柱作为卡扣,4圆柱作为定位点,内槽设置0.15mm高度差台阶,以适配底片厚度。实测平整的69底片装上去效果还不错。 渲染图 实拍图-还没洗刷掉底胶所以看起来有点脏 上下片夹已进行公差优化(0.2mm),FDM打印机建议使用0.4mm喷头,0.2层高进行打印。也可使用SLA打印以获得更好的成品外观。 模型下载 70mm版本,用于Elevanfilm Mini Projector 点击下载 85mm版本,适配标准马田片夹 点击下载 赞助二维码: 如果觉得有帮助的话,可以考虑请我喝一瓶冰阔落噢!
Elevan2021年8月5日


