[ATM] Tri-shiefspiegler

["David Williams" <dwilliams1128@earthlink.net>]

Hello

Does anyone know of the advantages of the Tri-shiefspiegler telescope besides that there is more consentration of light in the first few rings in the difration patern of a star?  And therefore better resolution at the same power.  It apperently has 3 mirrors, but do you know if it has an optical window too?  How difficult are these instruments to make?  Are they pretty heavy (like their density ratio compared to other telescopes)?

Thanks
David Willliams
dwilliams1128@earthlink.net
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