ultra Ultra wide-angle Auto Focus 12-40mm F3.5-5.6 AF Lens for Panasonic OLYMPUS M4/3 Written by admin on January 14th, 2024. 1 12-40mm F3.5-5.6 AF Lens. This is an ultra wide-angle fisheye lens that is very compact yet creates sharp, high resolution images. Optical Structure: Zoom Lens.