White light filter as an ERF

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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Starry Jack
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White light filter as an ERF

Post by Starry Jack » Tue Feb 03, 2015 3:49 pm

While I wait for the funds for a proper ERF for a 100mm f10 achromat PST stage 1 mod project, I want to use a white light filter as the ERF. What kind of image will that provide?

Thanks,
Jack

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marktownley
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Re: White light filter as an ERF

Post by marktownley » Tue Feb 03, 2015 8:02 pm

Welcome to the forum!

You won't get a Ha image this way, it will cut too much light.
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Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: White light filter as an ERF

Post by Starry Jack » Tue Feb 03, 2015 9:04 pm

Thanks. How about welders glass combined with a UV IR cut Filter?

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Re: White light filter as an ERF

Post by marktownley » Tue Feb 03, 2015 10:14 pm

Nope, fraid not. Welders glass is incredibly poor optically and would also cut the light too much.
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Re: White light filter as an ERF

Post by Starry Jack » Tue Feb 03, 2015 11:26 pm

Fair enough. What is the most cost effective ERF source you know of for a sub-objective ERF considering I am willing to make it internal and smaller than the objective.

Can't swing $800 for a 100mm objective ERF.

Best,
Jack

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Merlin66
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Re: White light filter as an ERF

Post by Merlin66 » Wed Feb 04, 2015 3:50 am

"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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swisswalter
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Re: White light filter as an ERF

Post by swisswalter » Wed Feb 04, 2015 5:19 am

Hi Jack

welcome to that wonderful site. Have fun in the sun.

Sometimes you can find the ERFs used on this site, on astromart, U.K. Astronomy Buy&Sell or astronomie.de
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: White light filter as an ERF

Post by Starry Jack » Fri Feb 06, 2015 2:27 am

Neo,
Thank you for the internal ERF description. That is indeed encouraging.

Starry Jack

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