Our Xena machines, the Scan Station and Kinetta all have travel systems for the sensor and lens. This allows for maximizing the sensor area to the film gauge. The Scan Station, for example, is a motorized system i.e. user friendly with preset positions for 8mm, 16mm and 35mm for the lens and camera that are moved by the control software. Other scanners like the Arriscan Scannity, etc. change the gate and optics for each gauge. I have found that especially with color sensor scanners oversampling of the target resolution is very important, particularly with grainier film. Under-sampled color mask scans tend to end up looking very "blotchy" and low resolution with grainier film as the grain pattern can't be resolved well and each color record is very low resolution relative to the target scan resolution.