A spacer designed to increase the distance between the lens plate and the focusing mount, the WHF-9 50mm Extender helps in achieving close-up focus when using the Cambro REPRO system. Compatible with both the Long Helical Focusing Mount and the RPM-GFX Helical Focusing Mount, WHF-9 units can be stacked atop one another or WHF-7 25mm units for further extension.