Great accessory lens for the Olympus Tough TG-4 (and earlier models in the series). It multiplies the 25-100 range by 0.74x, bringing the camera range to 18.5mm at the wide end. The lens is waterproof, so you can submerge the entire kit up to 15m under water. The fisheye distortion isn't excessive and allows for great shots. The lens now has a thread for attaching the filter.
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