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 Why focal length is should be 40 mm? 
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One Eyed Hopeful

Joined: Mon Jul 11, 2016 3:06 pm
Posts: 1
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Hello guys

I want to make my own HMD smaller.
To achieve it, i should make Focal lenght less than 40mm.

I tried 25mm Focal length with 6" display and it seems fine, coz i can see everything on display, no cutting.

So, is there any formula or rule that it should be not less than 40mm?


Mon Jul 11, 2016 3:10 pm
One Eyed Hopeful

Joined: Tue Oct 11, 2016 3:49 pm
Posts: 5
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It is difficult for most people to focus their eyes with lengths < 40mm.


Tue Oct 11, 2016 6:16 pm
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