Lens Accessories for professional use with the following features:

• Increased Brightness: Increases lens brightness by 3 stops.
• Focusing Function: Maintains autofocus functionality.
• Focal Distance: Reduces focal distance by 0.71 times, allowing conversion of small sensor cameras to full-frame cameras.
• Aperture Adjustment: Precise aperture adjustment.
• Construction Materials: Made from zinc alloy for stability and reliability.
• Coated Contacts: Gold plating on connection contacts for improved data transmission.
• Thread: 1/4" thread on the bottom for attachment to a tripod or other support.