Extension Ring 46 with Focus Knob, provides manual focus for compatible zoom lenses. (Extension ring equipped with port lock).
Compatible Lenses: (as of June2014)
* Compatible FC focus gear required for manual focusing (can be used in conjunction with a compatible zoom gear).
* Until now, auto focus has been the only option available when using a zoom gear. With the new Extension Ring 46 with Focus Knob, you can now manually focus a compatible zoom lens. When your camera's AF frames do not cover your subject, you can manually focus a compatible lens without changing composition.
* This product is the ideal solution when you shoot fast-moving subjects (which even the latest auto focus may not follow) or when you shoot in dark environments and when there are lots of particles suspended in the water; all situations where auto focus will not function correctly.
* The focus knob is located in an ideal position and angle to be easily operated with the index finger and thumb.
|Function / Efficiency|
|Extension Length||46mm / 1.8 inches|
|Depth rating||100m / 330 ft.|
|Port Mount||Sea&Sea MDX Mount|
|Housings||Sea&Sea MDX-series Housing|
|Dimensions||132 x 61.4mm / 5.2 x 2.4 inch (DIA x D)|
|Weight||525g / 18.5 oz|
|Materials||Corrosion-resistant aluminum alloy (anodized)|