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Question about gears ring for manual lens


Srdjan
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HI everyone, I have question for you. I m beginer in this field some I need little help. 

I have intention to make 0.8 module gears ring for manual lens so I can use it with my Follow Focus. I don't like plastic versions that I can buy on ebay. I have nice collection and I wont to use them for video.

As I understand it is very important if I use more than one lens that outer diameter of all of gears rings have to be same (so I don't have to set follow focus every time). And this is usually standard for lens line for special manufacturer (Zeiss, Canon, etc).

1. Are there some standards (in the terms of diameter) for all manufacturers of cine lens for the size of outer rings? If it exist can I find drawings so I can use them to make mine? 

 

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