Creating a widescreen 2.35:1 image using a camera with a 16:9 (1.78:1) sensor requires you to either crop the image or use an anamorphic lens attachment such as the SLR Magic Anamorphot 1.33X - 50 Anamorphic Lens Attachment. The SLR Magic adapter features a 1.33x anamorphic element that allows you to use the your cameras entire 16:9 sensor to get a 2.35:1 aspect ratio, as opposed to throwing away information by cropping the 16:9 sensor to achieve an image with a 2.35:1 ratio. Cropping an image causes a loss in resolution, but the Anamorphot 1.33x - 50 is actually squeezing more information onto your sensor. This does result in your recorded footage having the classic tall/thin squeezed image. However, this is easily expanded to a 2.35:1 aspect ratio in most NLE systems, and cameras with variable display adjustments allows you to stretch your image in the viewfinder.
The Anamorphot mounts onto your taking lens and features three locking screws that you tighten to secure the adapter once you have aligned it on your taking lens. Please note you can only use the Anamorphot on lenses with a non-rotating front, otherwise the anamorphic effect will rotate as you change focus. The Anamorphot's native mounting thread size is 62mm and will mount directly to lenses that feature 62mm filter threading. The included three step-down rings allow you to mount the attachment on optional lenses with a 49, 52, or 58mm front thread. You can use the adapter on lenses that feature a front filter thread larger than 62mm by using optional step-up rings, however optimum results are not guaranteed, and SLR magic recommends using the adapter on lenses with a front element that is physically smaller than 50mm in diameter. The Anamorphot features a Normal/Near adjustment setting. SLR Magic recommends setting the adapter to Normal, and only adjusting the setting to Near when shooting objects closer than 6.5 feet.