Why focal length is should be 40 mm?

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vrdevel
One Eyed Hopeful
Posts: 1
Joined: Mon Jul 11, 2016 3:06 pm

Why focal length is should be 40 mm?

Post by vrdevel »

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?

Thanks

AdamMunich
One Eyed Hopeful
Posts: 5
Joined: Tue Oct 11, 2016 3:49 pm

Re: Why focal length is should be 40 mm?

Post by AdamMunich »

It is difficult for most people to focus their eyes with lengths < 40mm.

Cheers,
-Adam

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