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Yep the blue objectives are the better ones, a lot of the gold objectives have been affected by rust issues. The new design reduces the stress on the objective and gives a much sharper image.
The purchase of a second hand solar scope requires quite a lot of experience and help from the seller. When I sold my PST (blue objective) and SM40 filter I made sure that the buyer was one hundred percent happy with the way I had treated the unit, that the unit was defect free and it was working as it should.
If you are intending to buy one, it is recommended that you do all the appropriate research before buying. If you know of someone who owns a solar scope of any description get them to go with you and look at the scope. Solar scopes are fragile and very dangerous if damaged and more so in the hands of someone who is unfamiliar with how they work. The rust issue just makes it defective (not dangerous) but just highlights how carefully one should be inspected.
Glad it worked out for you, but this should serve as a warning for those buying solar scopes.
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