I have never expected it, but want others to understand it. I agree with all that is being said.
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Yes, the Backscatter greenwater filter for the GoPro is awesome!!!
FLEX GREENWATER Filter for GoPro Hero3+ and Hero4 Standard Housing
When I added it to my GoPro the difference was night and day. No more green gloom in my videos. Here's my examples:
Without filter:
With Greenwater filter: