ask ko din so bale wala po ito yung "keystone correction" ?
Keystone Correction: In addition to the zoom lens feature, mobile users should consider the benefits of keystone correction. When you project an image from any angle other than straight onto the projection surface, the result is an image that is not completely square, instead appearing trapezoidal. Most projectors include a feature called vertical keystone correction, which correct the trapezoidal effect which results from tilting the projector downward or upward. Others go a step further and provide additional correction for horizontal keystone, which occurs when you are projecting from either side of the screen. Keep in mind that applying keystone correction results in a loss of detail and sharpness, but it can be invaluable when your projector cannot be set up perfectly square with the screen.