The projector lens improves the light utilization (make it more focus) and solves the problem of astigmatism.

Applicable to optical glass with high fineness and super-soft material such as LCD, ITO inductive glass, digital camera lens and projector lens.

If you are on the road and trying to get your projector set up in a hurry, this removes any doubt about the current position of the zoom lens, which can save you a few seconds.