The RF-S 3.9mm f/3.5 STM Dual Fisheye Lens from Canon is designed for the EOS R7 APS-C mirrorless camera system, a full-frame equivalence of 6.2mm is provided. Pairing this lens with the EOS R7 allows recordings up to 4K 30 fps. The dual high-performance fisheye lenses allow you to capture stereoscopic 3D 180° VR imagery with a 144° field of view to a single image sensor, simplifying your workflow and saving you time in post.  Driving the RF-S 3.9mm f/3.5 STM Dual Fisheye is a gear-type stepping motor (STM) with a dual-lens autofocus mechanism, which drives the left and right lenses in unison. This makes autofocus as simple to operate as it is with an ordinary lens. The electronic focusing/control ring and the left-right focus difference adjustment switch enhance operation by allowing adjustment of the left-right focus differential. The RF mount and the folded optical design allow for a compactl lens design that's easy to use in tight spaces. Weighing just 10.2oz, this dual fisheye lens conveniently fits in most bags and is perfect for travel. Designed to support filters, 30.5mm screw-on filters can be attached to the rear of the lens, as well as a filter holder for cut gel and polyester filters. Ghosting and reflections are noticeably reduced by Canon's air sphere lens coating. During challenging lighting conditions, such as backlit scenes, more contrast and uniform colors are present in your images.