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Nauticam Port Zoom Gear Kit
Part #: Nau-36162
This special zoom gear and port kit allows the physical macro switch on the Olympus 12-50mm lens to be operated, and enables the lens' entire zoom range. This solution provides both more magnification and the full range of focal lengths from 12-50mm
Please refer to Nauticam Port Chart
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I hesitated to buy the Nauticam 12-50mm port for the Olympus 4/3 lens because of its steep price. But I caved because the lens is perfect for all-around photography underwater: a nice short telephoto macro, wide enough for a decent landscape, and long enough for a bit of reach to shoot a fish portrait. That said, there aren't too many options that would allow a photog to take advantage of all the lens' abilities unless you buy this port, so there you have it.
The port fits snugly and securely using a single o-ring and Nauticam's cool locking mechanism. There are two knobs to make adjustments: one on the port to lock in the strange macro mechanism on the lens. Kudos to Nauticam for figuring out how to make that work. And the other on the housing to zoom. The zoom mechanism must be configured using a metal gear sheath that goes over the lens. This is not easily attached, and I just leave it on all the time because it's a pain to remove and replace. The zoom mechanism doesn't seem to allow the use of the mechanical zoom on the lens. I could be wrong. The zoom mechanism that allows for smooth video zooming is a bit slow, but I overcome this by flipping the macro switch and the lens moves to the telephoto end of the zoom very quickly. The flat port causes a bit of distortion on the corners shooting wide, but it's acceptable to me.
Bottom line: the port works very well, but because it's pretty much a one-off item for a limited market it's pricey.
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