Criterion Solar Prominence Viewer

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Merlin66
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Criterion Solar Prominence Viewer

Post by Merlin66 » Thu Apr 27, 2017 6:41 am

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?????
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Valery
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Re: Criterion Solar Prominence Viewer

Post by Valery » Thu Apr 27, 2017 8:16 am

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.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

edobosz
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Re: Criterion Solar Prominence Viewer

Post by edobosz » Thu Apr 27, 2017 8:58 am

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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zorgdotnl
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Re: Criterion Solar Prominence Viewer

Post by zorgdotnl » Thu Apr 27, 2017 9:01 am

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
criterion1275.jpg (115.3 KiB) Viewed 835 times

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Montana
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Re: Criterion Solar Prominence Viewer

Post by Montana » Thu Apr 27, 2017 2:29 pm

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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