Question about Canon EF-S 10-22mm f/3.5-4.5 USM - (EU)

- Is the zoom manual?: Yes, the zoom is manual. To zoom in, you need to turn the zoom ring on the lens.
- Is the diaphragm manual?: No, the diaphragm is not manual. The aperture settings are automatically managed by the camera, although the lens has a circular aperture for pleasant background blurring.
- How many mm must the filter be?: The filter must be 77 mm, as the filter thread on the front of the lens is 77 mm.