The footage was shot on a Canon 60D with a reverse lens adaptor and a standard 17-85mm kit lens. It was pretty windy on the day so it was really hard/impossible to get a good steady shot.
I am pretty sure the big spider is a female Nephila Plumipes, while the small one is the male. They are probably the most common spiders in Queensland, and are found in pretty much every backyard or garden. The female can be as big as 45mm, while the male can only grow up to about 6mm. The male and female is usually found in the same net that can be up to a meter in diameter.