Diopter, 138mm

The diopters from Schneider Optics are available in Full, Split, and Spot options.

Full
A classic full diopter reduces the close focus distance and even allows you to take macro images without using a dedicated macro lens. 

Split-Field
One of the most unique cinematography tools, the split-field diopter creates two depths to your frame, allowing you to keep two subjects in focus at the same time.

Spot
A classic diopter with a plain, polished area in its center. This leads to a sharp image in the middle and an out-of-focus area towards the edges. For dreamy images with an in-focus center. Area in center is available in 25mm or 50mm.