Data Projector Ceiling Mount Is It Possible To Project My Desktop From A Data Projector Onto A Far Wall Without Stretching The Picture??

Is it possible to Project my desktop from a data projector onto a far wall without stretching the picture?? - data projector ceiling mount

Hello,
I would like to presentations from a laptop via S-video cable project.
The projector is mounted on the ceiling.
The problem is that the projector is about. 50-foot motorized screen and the picture is much larger than the screen.

Please can someone me to the resolution is a way to directly reduce the size of the frame or a device to reduce the image to fit on the screen.

BTW, the projector throw distance of 50 meters.

Thank you,