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Old 29-10-2020, 09:47 PM
Stevec35 (Steve)
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Join Date: Aug 2010
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Criterion spectroscope eyepiece

This could be of interest to anyone vaguely interested in spectroscopy who doesn't want to spend a lot of money. It's a 27mm eyepiece (Kellner I think) with a diffraction grating screwed in. Basically you aim your scope at a reasonably bright star, orient the grating appropriately and turn the telescope drive off briefly. A quite respectable spectrum then gets smeared out across the field of view. I've attached a sample spectrum of Altair. This has been gathering dust in my collection for many years and I just wondered if anyone might be interested in it. $25 plus shipping costs.

Cheers

Steve
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Click for full-size image (Altair_spectrum.jpg)
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Last edited by Stevec35; 30-10-2020 at 06:34 AM. Reason: Status
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Old 29-10-2020, 10:09 PM
IanT
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Eyepiece

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