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Design of H-Alpha filters

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16 years 7 months ago #67079 by michaeloconnell
Design of H-Alpha filters was created by michaeloconnell
For those interested in solar astronomy, here's an interesting article on the design of h-alpha filters:

www.designerinlight.com/solar/EtalonArticlePt1.pdf

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16 years 7 months ago #67274 by TrevorDurity
Replied by TrevorDurity on topic Re: Design of H-Alpha filters
Very interesting article Michael. Must be new as they even mention Lunt.

Have you seen Dave Groski's page?

www.considine.net/dgroski/halpha/

I was tempted to try and build his 60mm h-alpha scope last year but chickened out in case I messed it up and ended up looking through a scope that let too much energy through :wink:

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16 years 7 months ago #67286 by ayiomamitis
Replied by ayiomamitis on topic Re: Design of H-Alpha filters

I was tempted to try and build his 60mm h-alpha scope last year but chickened out in case I messed it up and ended up looking through a scope that let too much energy through :wink:

Trevor,

Let's not give up yet ... we can check things out by using our camera(s) as guinea pigs since their "eyes" are not as precious as ours.

I still have not given up on the idea of the modified PST. :D

Anthony Ayiomamitis
Athens, Greece
www.perseus.gr

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16 years 5 months ago #70420 by colinsk
Replied by colinsk on topic Re: Design of H-Alpha filters
I wrote that a couple of months ago. I am working on part 2 that describes the solid etalons used in DayStar and Solar Spectrum Filters.

I have been unable to get the filters for one of Dave's h-alpha scopes. But it would be pretty hard to make a mistake building it. All of the blocking comes from the two tiltable filters and the Red Glass ERF.

Cheers!

Colin

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16 years 5 months ago #70434 by michaeloconnell
Replied by michaeloconnell on topic Re: Design of H-Alpha filters

I wrote that a couple of months ago. I am working on part 2 that describes the solid etalons used in DayStar and Solar Spectrum Filters.

I have been unable to get the filters for one of Dave's h-alpha scopes. But it would be pretty hard to make a mistake building it. All of the blocking comes from the two tiltable filters and the Red Glass ERF.

Cheers!

Colin


Welcome Colin to the IFAS site! Hope you have fun here! :)
I'm looking forward to that second article Colin. You're first one was very good.

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16 years 5 months ago #70438 by TrevorDurity
Replied by TrevorDurity on topic Re: Design of H-Alpha filters
Hey Colin,

Welcome on board from me as well. It's a small world as I've followed your posts over on UKAI in the past :)

Hope you enjoy your stay!

By the way, how did the BF5 work out for you with your solar project? I see there is one for sale over on astrobuysell but not sure if it will give a decent fov.

Trev

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