The distance between the projector and the screen can indeed affect the image quality in a few ways. While a 380mm difference might not drastically impact the image quality, it can still have some consequences. Here are a few things to consider:
Image Size: The distance between the projector and the screen determines the size of the projected image. By positioning the projector closer to the screen, you might end up with a slightly larger image than intended. This can cause some parts of the image to extend beyond the screen borders, resulting in loss of information.
Image Focus: The focal length of the projector lens is designed to achieve optimal focus within a specific throw distance range. If you move the projector farther away from the screen than the recommended range, you may encounter some focus issues. The image might appear slightly blurred or lose sharpness.
Keystone Correction: Keystone correction is a feature in projectors that helps correct image distortion caused by projecting from an angle. However, excessive keystone correction can introduce some image artifacts, such as slight geometric distortion or loss of image clarity. If the projector is mounted farther away, you might need to use more keystone correction, potentially affecting the overall image quality.