Parts for project:
25.5-46mm Step Up Filter
Robin Kanta Photo
805-735-3938
photofilter.com
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Tiffen ND Filter Kit (3)
TIDNDK46
B&H or other Tiffen suppliers
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Go Pro Hero HD
Spare Housing
gopro.com
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The small sports camera, like the GO PRO Hero offer excellent quality, BUT ... when shooting into the turning propeller they create a distracting strobe effect.
This video shows various Neutral Density Filters and how to avoid this strobe annoyance.
You will need a 25.5 to 46mm (or larger diameter) filter step-up ring
A Neutral Density Filter in 1.2 to 1.5 range in the same diameter as the outside of your step-up ring (I used a Tiffen Filter Kit for ND filters with 0.6, 0.9 and 1.2 - then I stacked the 0.6 and 0.9 to come up with the 1.5 ND used in this demo video. Careful with the small ZERO screws when removing the GO PRO case outer ring, you will need these again to remove the step up ring after you have positioned and drilled the holes in the ring.