be careful of the cheap saxons -many of their models have the ruby coating which is aplied to dim them for bright daylight use; you want the non-ruby coated for astro
check
http://www.gumtree.com.au/s-ad/dunda...0mm/1077075453 , which state are you in? these look to be in better condition
http://www.gumtree.com.au/s-ad/cherm...ars/1088808968