Ok trying to explain this... in the A-10C the HUD text gets larger( keeps it's aspect size) when you zoom in and smaller when you zoom out, in FC3 the F-15 HUD the text will get larger if you use the keyboard to zoom in but with track IR I zoom in and the HUD stays the same size( making it hard to read when I zoom in to get a zoomed view of HUD symbology) .. am I missing something with the z axis setup with track IR for FC3??