Common relectors for H-a?

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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Rusted
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Common relectors for H-a?

Post by Rusted »

I there was a specific solar filter foil, with slightly lower reflectivity than standard, we could routinely use much larger apertures for H-alpha at low cost.

Our common reflectors could be used without the astronomical cost of full aperture D-ERFs.

No need to strip our existing mirrors.

With most of the solar heat removed there would be much less thermal "stress" on the optical train.

The familiar PST mods and Quarks, we use now, would be protected from excessive heating from larger apertures.

There would be much lower thermal agitation in the optical path due to a lack of overheated, bare glass absorption.

So common Newtonians [and others of course] could be quickly convertible between The Dark and the Light Side.

There are very obvious dangers for the unwary in trying to view in white light without added and safe filtration.
They just need to use standard visual filter foil just as they do now.

Any constructive thoughts before I order a few hundred meters from Baader?? :mrgreen:


http://fullerscopes.blogspot.dk/

H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
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Re: Common relectors for H-a?

Post by marktownley »

Sorry, it won't work. It will also cut transmission at the wavelength being observed. That's why erf's are needed for narrow band. Stripping the mirror only works for wide band observing in white light.


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Re: Common relectors for H-a?

Post by Rusted »

Thanks. I'd better cancel that order. ;-)


http://fullerscopes.blogspot.dk/

H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
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