Bag bellows for 4x5 format (G/GX) gives you a range of 25mm to 310mm, allowing movements without vignetting.
TOYO G/GX bellows have a wide internal frame to minimize internal vignettngwhen using extreme movements. They will fit all current models of TOYO 4x5cameras including TOYO VX125 and ROBOS 45 and Omega-View models 45F and45C. Early TOYO D45 models may require modification to bellows.