Various type of integrating sphere accessories with different types of reflectance materials are available.

Port Expanders and Reducers

Port reducer reduces the clear aperture size of a port. The 0.5 inch to 1.0 inch Port expander does not expand the actual clear aperture but allows mounting of 1.0 inch adapters on the port. For the best result, pick an accessory that has the same kind of reflective material as the sphere itself, if available.