I found that GoPro (at least mine GoPro2) "add the distance), so what I remember from my dive being 2-3meters (6-9ft) away on the movie it looks almost doubled. That’s why mounting of my choice is telescopic pole. Besides imagine getting a nice close up of moray eel with mask mount.... Pole mount is also good to "look up" any reef crevices. GoPro works quite amazingly in low light, so this setup is good for all the lobsters or hiding octos as well.