The throw ratio of a projector is the ratio of the distance from the trace projector to the screen to the size of the projected screen, throw ratio + projection distance/screen width. With the development of projection technology on the market, the projection ratio is getting smaller and smaller. From the original telephoto lens to the current ultra-short-focus lens, the development of technology has enabled the projector to have a smaller throw ratio and a large screen, providing convenient use for users with insufficient home space.
Some brands of projection on the market support zoom. Within a certain throw ratio range, different sizes can be projected at the same distance, which greatly facilitates the user's demand for the size of the projected screen.
Generally, the transmittance ratio of ordinary projectors is between 1.5-1.9. Now the popular ultra-short-throw projectors have a throw ratio of less than 0.6, making them ultra-short-throw lenses.
Some brands of projection on the market support zoom. Within a certain throw ratio range, different sizes can be projected at the same distance, which greatly facilitates the user's demand for the size of the projected screen.
Generally, the transmittance ratio of ordinary projectors is between 1.5-1.9. Now the popular ultra-short-throw projectors have a throw ratio of less than 0.6, making them ultra-short-throw lenses.
