Hobbies generally require the acquisition of 'stuff' .. and then you 'do' them. In golf, one acquires clubs and golfballs, shoes, gloves, wardrobe, then pays to play. Bowling has much lower overhead, a ball and shoes perhaps. Collections of any kind merely involve seeking out and acquiring new items, with possibly storage/display costs. What about home planetariums. There are some crazy things needed.
For those who restore old commercial planetariums - like old cars or old anything... the supply is scarce and dwindling. Getting the units is hard enough - many are scrapped and disappear. Fixing them, getting parts and manuals and expertise is even harder. For those who MAKE home planetariums, its a strange mix of the commonplace and the exotic. The problem seems to be - whats commonplace TODAY may not be tomorrow.
In making planetariums, if you find something that just 'works' and you need five of them - better buy twenty. The textbook case is the lenses that were so plentiful, so cheap back in the 60s-90s via Edmund Scientific. 9mm by 265mm .. they now cost about 7 dollars EACH. Building supplies are similar - a roll of vinyl flashing perfect for needling starfields was easily obtainable in my town 10 years ago, but has vanished. Galvanized trailer skirting for dome building could be had easily - gone so expensive now I could never have bought the 40 pieces I could afford 10 years ago. Light sources - bulbs, lanterns, flashlights - years of search have yielded only a few that produce really good results. Do we buy 5?
Better buy twenty!
For those who restore old commercial planetariums - like old cars or old anything... the supply is scarce and dwindling. Getting the units is hard enough - many are scrapped and disappear. Fixing them, getting parts and manuals and expertise is even harder. For those who MAKE home planetariums, its a strange mix of the commonplace and the exotic. The problem seems to be - whats commonplace TODAY may not be tomorrow.
In making planetariums, if you find something that just 'works' and you need five of them - better buy twenty. The textbook case is the lenses that were so plentiful, so cheap back in the 60s-90s via Edmund Scientific. 9mm by 265mm .. they now cost about 7 dollars EACH. Building supplies are similar - a roll of vinyl flashing perfect for needling starfields was easily obtainable in my town 10 years ago, but has vanished. Galvanized trailer skirting for dome building could be had easily - gone so expensive now I could never have bought the 40 pieces I could afford 10 years ago. Light sources - bulbs, lanterns, flashlights - years of search have yielded only a few that produce really good results. Do we buy 5?
Better buy twenty!
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