The ALUM Anamorphic is a compact, experimental 1.33x squeeze anamorphic adapter. It features a 39mm filter thread and attaches directly to your existing lens, just like a standard filter. The adapter performs best with lenses around 35mm focal length on full-frame (35mm format) or shorter. It can also be used with longer lenses (e.g. 50mm), though the optimal focus point will be closer compared to shorter focal lengths.