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I just bought an 80mm x 400 FL lens from Surplus Shed in USA on Ebay. Doesnt look too bad and was pretty cheap ($29US). Its a coated doublet mounted in a plastic housing and I intend to use it for solar viewing. The same outfit have a 80 x 900 FL for the same price. Postage was very reasonable and got here in 8 days.
BTW - if anyone knows of a supplier of thin walled Aluminium or SS tubing in NSW I need some to complete the project.
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