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Use this to fit PL-mount lenses to crop sensor L-mount cameras or full-frame sensor cameras with crop mode. The speed booster uses an advanced 5-element/4-group optical design by Caldwell Photographic, incorporating ultra-high index, tantalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion, and reduced vignetting. The Speed Booster Ultra has a magnification of 0.71x as well as a design that makes very effective use of exotic materials at the furthest limit of glassmaking technology and is well corrected for use with virtually all full-frame SLR lenses regardless of exit pupil distance.
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