In June 2005, the National Library of Australia had digitised just 25 photographs of their collection of 84 prisoner identification cartes-de-visite of Tasmanian prisoners, titled "Convict portraits, Port Arhur,1874", with the long-standing and correct attribution to commercial and police photographer Thomas J. Nevin. The total of 84 in the NLA collection is available here:
Nevin, Thomas J., 1842 ca.1922 : Convict portraits, Port Arthur, 1874
http://nla.gov.au/nla.arc-21336-20031011-0000-www.nla.gov.au/pict/list/nevin.html
Webshot 2007
Photographer Thomas J. Nevin
NLA Pictorial list: Tasmanian convicts
These are all now digitised. The NLA's current equivocation regarding Nevin's attribution is irrelevant and meaningless. See this article and links.
Webshots 2005
Photographer Thomas J. Nevin
NLA Pictorial list: Tasmanian convicts