Adapter Ring Canon 11-24mm for the Lee Filter Halter SW150 Mark IIPlease note that due to the physical size of this lens, and the extremely wide angle
of view, the SW150 filter holder will vignette (or rather, the filter guides intrude into
the edges of the image) at the widest angles. To avoid any vignetting we
recommend using a minimum focal length of 13.5mm when using the filter holder
with two filter slots and 12.5mm when using the holder with one filter slot.