sure. it could mount a 1/4 for gopro. 

hello , we are the seller, you could use an adapter to step the 52 down to a 49 , there is a adater ring kit https://www.amazon.com/dp/B00JL4HGAI, 

There are 6PCS adapter ring included in this flash, here is the size:
52 55 58 62 67 77mm, as long as your lens size is one of them, then could be used,
Here is the way to check your lens size:
Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "?" (diameter) symbol. For example: ?52 = 52mm lens thread size.
If your lens size is none of them, please tell us, we may include the size you need but at this case, this item must be shipped from China so that we could pack with this adapter ring you need. 

Yes it can. This card is one of those specifically recommended for use with the GoPro Hero 4. 

The kit comes with 9 adapter rings for all sorts of lens sizes. You screw the adapter onto your lens, then the square piece screws onto the adapter and the filters slide into the square piece. The lens sizes the adapters fit are 49 mm, 52 mm, 55 mm, 58 mm, 62 mm, 67 mm, 72 mm, 77 mm and 82 mm. It matters more of the lens size than the camera you are using. Have fun with them!!