Revar Cine Donut Diopters are standard 138mm diopters with a precision cut center hole available in multiple sizes for various focal lengths and percentage of effect in frame. 37mm hole will give you a decent percentage of the frame in focus on telephoto lenses. 49mm is best for mid to wide angle lenses. 60mm is for wide angle lenses. Create spherical distortion with clear point of focus. The most popular densities are +1 and +2 if you are looking for a strong effect. +0.25 and +0.50 are for a more subtle effect. We use high quality Schott BK7 glass that has an index similar to your lens elements. Manufactured to the highest tolerances, this glass will exceed performance of other diopters.
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