Canon 600mm f/4.0L USM Aparture problem [Canon Lens Crudoimage Care] will be performed by our In-House technician. We Provide 1 year warranty on all services repaired by Crudoimage. We do not provide any warranty on Camera Fungus cleaning and Colour coating. The placed order value may increase or decrease after final checking by our technician. We will start only when you’ll approve the final price.