Criterion Solar Prominence Viewer

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Merlin66
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Criterion Solar Prominence Viewer

Post by Merlin66 »

I came across this in the December 1975 S&T, p431.
It claims to have a cone occulting disk, an adjustable iris, tilting filter element, optical transfer lens and a Herschel wedge (sound familiar, Alexandra??)
It is shown mounted on a SCT (and Newtonian) with NO additional filters (!!!!!) and the blurb says "Only the Criterion SPV works with any telescope. Newtonians require a simple slight modification of the primary mirror (I'm assuming moved up the tube to provide focus??) All Cassegrain telescopes can be used without any modification whatsoever"

No mention of ERF's or cooked secondary mirrors......

Has anyone seen one of these?????


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Valery
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Re: Criterion Solar Prominence Viewer

Post by Valery »

If only this device will be successful it will lasts until today for sure. But where it is?

There is no free lunch here and there.


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edobosz
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Re: Criterion Solar Prominence Viewer

Post by edobosz »

Those components you mentioned sound similar to a coronagraph e.g. Baader Mark-IV Coronagraph?? Also see some discussions on cloudy nights here: https://www.cloudynights.com/topic/2603 ... ce-viewer/

And here: https://www.cloudynights.com/articles/c ... agraph-r36

Ted


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Re: Criterion Solar Prominence Viewer

Post by zorgdotnl »

Hi Merlin, never saw one, but found some infos on CN:

https://www.cloudynights.com/topic/2603 ... ce-viewer/

Never did it myself, but I have seen solar projection with Schmidt cassegrain in those time, so dangerous for many reasons.

Is it this add? (thanks waybak machine)
criterion1275.jpg
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Re: Criterion Solar Prominence Viewer

Post by Montana »

Mine has an iris, cones and there is supposed to be a red filter and Halpha filter too. I didn't trust it so I used my Baader D-ERF on the front as well. Hopefully it will be fixed soon and I can have a good test of it :)
So perhaps this one has all the filters too.
Alexandra


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