B00460WBG6 Opteka Platinum Series 0.2X Low-Profile Ninja Fisheye Lens for JVC GZ-HD500, HD520, HD620, HM300, HM320, HM340 and HM550 Camcorders

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Direct 37mm mount, adapter included (if necessary)
Produces an extraordinary degree of barrel distortion
Sleek low-profile design — Adds only 1cm of length to your camcorder
Ideal for filming that requires minimal drag
1 Year Opteka Warranty