As far as I know they have 25" Obsession Dob. They have other big telescopes as well.
This is from their website "about us":
Quote:
About us Gingin Observatory was opened as a public observatory in October 2001 and has always been operated as a private business, co-located with the Gravity Discovery Centre, an hour drive north of Perth. The founding Astronomer was Mr David Nicolson.
The business is now operated by Donna Vanzetti (aka "The Stargazer") and Carol Redford (aka "Galaxy Girl")! In October 2007, the opportunity to manage Gingin Observatory came up whilst Donna and Carol were employed as Co-Managers at the Gravity Discovery Centre. With a love of astronomy in their back pockets, they took this special chance to take on a new business with lots of potential.
At Gingin Observatory visitors experience the wonders of space by viewing through telescopes, engaging with astronomers and by interacting during a big screen presentation that highlights our Universe.
The building is split into two areas. The space observatory (with a fully retractable roof) houses 5 large telescopes, including the largest in Australia for public access, and 6 pairs of high magnification binoculars. The other half of the building is a theatre room that also contains a reception and shop.
In addition to these facilities, the new $1M science grade Zadko Telescope, committed to Gamma Ray Burst research, is situated next door to the observatory in its own dedicated dome. It is the largest telescope for public access in the Southern Hemisphere and is integrated into stargazing nights at Gingin Observatory.
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http://www.ginginobservatory.com/
cheers