tonydtv Posted September 14, 2014 Share Posted September 14, 2014 Might as well throw this into the anamorphic forum explosion! I came across this focusing solution earlier this year by taking my 20% understanding of comments made on varied forums about optics and vaguely knowledgeably combining elements from the large amount of random glass I've amassed over the years. I don't claim to know much about optics, and I'm certainly no engineer, but this technique has worked when I didn't have the budget to rent a set of Kowas or the like. This is definitely a lo-fi, DIY solution. The other products popping up around the forum are higher quality than this, and really this solution's quality depends on the quality of glass you use. Also, I could be totally wrong about how and why this is working. But if you like to tinker as much as I do, and don't mind a lo-fi aesthetic, then, here: (handheld the optics, hence the wobbles) In a nutshell, arrange the following items in the following order: a. Camera b. Taking Lens c. Anamorphic Adapter d. Achromat e. Wide Angle Adapter Instructions: 1. Mount camera, taking lens and anamorphic adapter together. 2. Attach achromat to the front of the anamorphic adapter, as close to the glass as possible. 3. Place the wide angle adapter as close to the achromat as possible. 4. Through your viewfinder (and not lens markings) set infinity focus. 5. Move the wide angle adapter away for close focus. At some point you'll start to vignette from the front element getting to far away. If you want closer focus, reset your 'infinity focus' to something closer, like 15ft. That's what I did in the embedded video. There's more notes in the video description, but here's a couple more to get you started: The trickiest part is finding the relationship between strength of the achromat to the strength of the wide angle adapter. I'm sure someone with knowledge of optics will say how. Loudly. Before dropping cash on any achromat, you can use closeup filters to ballpark a strength. In fact, you can use closeup filters, but image quality will suffer. But good if you want to experiment. Also, old DVX or HVX wide angle adapters are a good starter to tinker. 72mm or higher gives you more travel before vignetting. Any questions, ask away! Jim Chang 1 Quote Link to comment Share on other sites More sharing options...
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