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Features:
- Industry's best aperture ring covers a 8-stop range markings, clearly indicating actual number of f-stops.
- Compatible with both Nikkor G lens & F lens (include non-AI & AI lens mounts).
- Advanced 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass by Caldwell Photographic in the USA (patent pending).
- Increase maximum aperture by 1 stop.
- Increase MTF.
- Makes lens 0.71x wider.
- The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads.
- Note: This Speed Booster ULTRA is NOT fully compatible with full-frame Sony A7, A7R and A7S. When the Speed Booster® are used with Sony A7, A7R or A7S the camera is required to be used in the "APS-C Size Capture" mode.
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