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The DZO X-Tract 18-28mmT8 Probe Zoom is one of the only Probe Zoom lenses available, and the range of 18-28mm and Full Frame coverage gives you an amazing range for both S35 and FF sensors. The front section of the lens is completely waterproof. Close focus is an insane 0.2” from the front element, so you can basically focus as close as you want. A T8 maximum aperture is excellent for these types of specialty lenses, and image quality is impressive. This is a very high resolution, low distortion lens.