Something like a 10” F4 truss Newtonian is going to have a much smaller demand due to the fact it requires a buyer with:
1. Imaging as their main pursuit
2. hefty mount
3. ability to lift it onto the mount
4. Observatory?
Also there is the cost of freighting such a scope thousands of kilometres unless one lives in Perth……
Now if Trevor had been advertising a 4” refractor for 60% of new price….
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