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PST repairs
I've been in the unfortunate position of having bought two PST's which ended up showing the "rust" defect. The third was OK!!
Firstly the "rust' does NOT affect the safe operation of the scope. It is 100% safe, all the time.
Original owners, with receipts for purchase have managed to get free warranty repairs of this defect within the 5 year coverage. I know of at least 15 successful repairs.
They offer a great introduction to Ha solar observing.
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