These are pretty amazing little lizards. The National Aquarium in Napier has quite a number of them in a large display. The images below were shot through "glass/perspex" (I did not check), and was taken using natural lighting at ISO 3200. Post processing was mainly aimed at noise reduction.
The Australian Water Dragon consists of two sub-species. The photos here are of Physignathus lesueurii lesueurii the Eastern Water Dragon, as is evident in the black band behind the eye. Australian water dragons are extremely shy in the wild, but readily
adapt to continual human presence in suburban parks and gardens. They
are fast runners and strong climbers. When presented with a potential
predator, they seek cover in thick vegetation, or drop from an
overhanging branch into water. They are able to swim totally submerged,
and rest on the bottom of shallow creeks or lakes for up to 90 minutes.
Click to enlarge.
Canon 600D, Tamron 18-270mm f3.5-6.3 Di II VC PZD. Focal length 70mm, Exposure 1/60sec at f5.6, ISO 3200, Focus auto, VC on, Flash none, Filter none.
Canon 600D, Tamron 18-270mm f3.5-6.3 Di II VC PZD. Focal length 142mm, Exposure 1/40sec at f5.6, ISO 3200, Focus auto, VC on, Flash none, Filter none.