The Destek V4 VR headset is a well built headset at a really low price. It is competitively priced at $19.99 and is positioned to capture the low-cost VR market. The company has obviously done a lot of work to ensure that the headset delivers a good immersive experience for users.
Inside the box is a bag to store the headset, a head strap and a head top strap. There is also a lens cleaning cloth. The top of the headset has a distance adjuster, and there is a pupil distance adjuster underneath. There is also a stand for the phone.
The V4 VR feels solid and robust, and the headset has a wide field of view (FOV) of 103 degrees. Binocular vision, used to perceive depth and distance is 114 degrees in humans, so having a wide field of view is important to deliver a strong immersive experience.
In VR headsets, magnification is a factor in the VR experience, as are the diameter of the lenses.
A wider FOV would deliver a better immersive experience, but in order to do this the headset would have to have a larger diameter lens.
This means that the headset would need to be bigger and heavier. It would also result in distorted images due to the huge magnification needed.
Source: ZD Net