Hi Could someone please clarify which throw distance calculator is most accurate - the one on projectorpoint.co.uk or projectorcentral.com. I have tried both of these for the Hitachi PJTX100. I have set both for a throw distance of 10.5'. The comparisons are as follows; projectorpoint - min zoom = 55" screen width, max zoom = 69" screen width. projectorcentral - min zoom = 61" screen width, max zoom = 98" screen width. Can anyone advise which is correct? Many thanks.