The Anamorphot 1.33x 50 is an anamorphic lens adapter designed for cinematography, it increases image resolution and detail by squashing / compressing the image horizontally by a factor of 1.33x to allow maximum utilisation of the cameras' sensor. Anamorphic lenses therefore require subsequent stretching, in post-production or at projection. Intended for use with shooting at 16:9, bringing the intended output to a standard 2.39:1 wide format with a higher resolution than simply letter-boxing the image in camera. The lens features an adjustable diopter for sweet spot adjustment controls on focus.This anamorphic adapter also of/ers unique effects such as horizontal flare and streaks from light sources and ellipsoidal bokeh, for cinematographers wanting a characteristic filmic look. Depth of field is also affected, as in practice when using an anamorphic lens a longer focal length is required in order to achieve the same angle of view. Therefore anamorphic lenses produce a shallower, more cinematic depth of field than the same lens without the adapter.The adapter has a 77mm front filter thread and a native 62mm rear thread with 58mm, 52mm, 49mm adapter rings provided. As such it is only suitable for lenses which have a front element size of 50mm or less.Limitations of close focusing are helped with the use of dioptres which further enhances image. resolution and sharpness on close / medium distance applications.PLEASE NOTE: Due to the additional weight of the Anamorphot adapter and extra strain placed on the taking lens the use of lens support is highly recommended / essential, particularly when using additional dioptres or on follow focus rigs. The alignment finger-screws require only fingertip tightening and loosening of one of the screws to secure the alignment.Specs:- Lens Type: Anamorphic Adapter- Format: 1.33x- Focus Type: Manual- Filter Thread Front: 77mm- Filter Thread Rear: 62mm- Close Focus: dependent on taking lens- Weight: 380gModel: SLRA50-1.33X