Hi Brendan
The Perspex of choice is the milky white stuff that you cannot see through, but tends to diffuse the light. I got a small cut off from a place at Slacks Creek. There should be an outlet in Ipswich I reckon? If not, let me know and I’ll try to find the details of the Slacks Creek place.
But…..why do you want a light box for your 30 sec galaxy supernova search images? Are you getting a bit creative or trendy? LOL!
Cheers
Dennis
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