The Fence

I have attached a Nikon Series E Zoom 75-150mm f/3.5 lens to a Nikon D2Xs via an AF Teleconverter TC-16A. According to my calculations, that provides a lens working in a 120-240mm focal range, and a field of view on APS-C format of 180-360mm. If I deploy the hi-speed crop mode on the D2Xs I get a field of view of 240-480mm at a reduced pixel count.