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TECHNICAL SPECIFACTIONS OF THE PROMINENCE VIEWER:
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I designed my prominence viewer according to the descriptions and calculations published by G. Nemec in
“Sterne und Weltaum” , 12/75. The following components are used:
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Auxilary Lens:
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40mm diameter, f=80mm, plano-convex, made by LINOS Photonics, Göttingen
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Apertures:
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set of 11 pieces for the off-axis mode, diameter range from 12.42 to 12.02mm, conical
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Material: Alumimium alloy, partly anodised, home-built
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Iris:
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1.0mm to 14.0mm diameter, mounted on flange, made by OWIS
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Objective-2:
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f=85mm, used of an old slide projector
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Halpha-filter:
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24mm diameter, Bandwith at 50% Transmission: 1.04nm; Peak Transmission 53.08%,
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ANDOVER CORP.
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