What are the two values required for estimating throw distance?

Estimating throw distance involves understanding how far a projector needs to be placed from the screen to create a specific image size. This process requires two key values: the width of the screen and the throw ratio of the projector.

The throw ratio is a crucial specification that defines the relationship between the distance from the projector to the screen and the width of the projected image. For instance, if a projector has a 1.5:1 throw ratio, it means that for every 1 unit of screen width, the projector needs to be located 1.5 units away from the screen. By knowing the screen width and the throw ratio, one can easily calculate the necessary throw distance, ensuring that the image projected fits correctly on the intended display area.

The other options do not provide the relevant values necessary for calculating throw distance. While a tape measure might be useful in a practical scenario, it is not a value for estimation. Similarly, knowing off-axis viewing locations or using a projector cart do not contribute to determining how far back the projector should be placed in relation to the screen width. Thus, the combination of screen width and throw ratio is essential for accurate throw distance estimation.