Cardboard seems like a Fisheye Lens?

Hi Guys,

I just using Google cardboard SDK and Easy movie texture to create a video app, I facing a problem which is

the result seems like looking from a fish eye lens( a bit ), it's like the video a bit close to me.

I not sure about is it possible to edit some attributes in the Gvrmainviewer to make the wide angle higher?

The only thing I found out is change the viewer type to Google Tech C1 Glass but it even more bad.

my video scene is a 3D sphere, I did tried to scale the sphere but Its doesn't work out, does anyone know how to

fix it? Many thanks!

Have a good day