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In yet illuminating another video from his tutorial series on special effects, DIY master Joey Shanks has provided us with another useful how-to guide, this time on how to use a split focus diopter. First, of course, you might wonder, what exactly is that? As opposed to shooting from two different angles, with a split focus diopter, you can easily capture two main focal points in just one shot. Therefore, it creates the illusion of a deep focus through a half convex glass that you attach in front of the camera.

As Shanks illustrates, this cool effect has been especially notable in classic films like "Jaws," "Carrie" and "The Thing." As for more contemporary cinema, Quentin Tarantino himself has utilized this effect in a number of his films, most recently in last year’s "The Hateful Eight."

Along with seeming like a rather easy effect to achieve, the split focus diopter itself seems like quite a bang for your buck as well. Courtesy of Shanks FX, watch the video above and learn how to add this special effect to your bag of tricks.

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