It seems that you can also capture zoom and DOF shots with your GoPro HD - which normally comes with a fixed lens (no zoom and no focus).
All you need to do is replace the original lens with the 2.8 - 12 mm Varifocal lens. You can do this yourself by dismounting your cam (see video tutorial below) or you can send it to RageCams and they'll do it for you.
GoPro DOF Footage Test with Varifocal 2.8 - 12 mm Lens (taken with GoPro HD 2)
You can use the small levers just as a follow focus - pull one and you zoom in and out; pull the other and you adjust the focus and depth of field. Combine your DOF footage with GoPro stabilizer shots + DIY slider shots and you've got yourself a more artistic video.
This lens has a f1.4 aperture value and allows you close the view angle from 135 degrees (widest) to 55 degrees (narrowest). Once you have your subject in focus, just tighten the small screws and you're set.
You can also get it at StuntCams but they don't give too much info about mounting, and it's a bit more expensive.
How To Remove & Replace the Original GoPro HD Lens
How To Change GoPro HD 2 Lens
GoPro Lens vs 6 mm Lens
Stay focused and shoot your outdoor adventures!
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