Which Herschel Wedge with C9.25?

Use this section to discuss "standard" Baader/Coronado/ Lunt SolarView/ Daystar, etc… filters, cameras and scopes. No mods, just questions/ answers and reviews.
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Dennis
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Which Herschel Wedge with C9.25?

Post by Dennis »

Hi,
what kind of Herschel wedge would you recommend for imaging only use with my C9.25 (with D-ERF)?
Is there a benefit of 2" versions like Baader or APM in comparison to 1.25" versions?

I already have a 2" Lumicon OIII Filter that i want to use with the wedge, so i guess the 2" APM Version is suitable?
Since i already have the energy reduction D-ERF coating of the scope i would like to go a more economic direction.

Thanks
Dennis


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: Which Herschel Wedge with C9.25?

Post by christian viladrich »

Hello Dennis,
Since you have a D-ERF, there is no need for an Herschel wedge. Just use your OIII filter.

This being said, if your Lumicon OIII was designed for visual observation, you will also need a IR-cut filter.


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Re: Which Herschel Wedge with C9.25?

Post by Dennis »

christian viladrich wrote: Thu Jun 30, 2022 1:59 pm Hello Dennis,
Since you have a D-ERF, there is no need for an Herschel wedge. Just use your OIII filter.

This being said, if your Lumicon OIII was designed for visual observation, you will also need a IR-cut filter.

Hello Christian,

thank you very much, i will try it out.


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: Which Herschel Wedge with C9.25?

Post by marktownley »

Dennis wrote: Thu Jun 30, 2022 1:10 pm Hi,
what kind of Herschel wedge would you recommend for imaging only use with my C9.25 (with D-ERF)?
Is there a benefit of 2" versions like Baader or APM in comparison to 1.25" versions?

I already have a 2" Lumicon OIII Filter that i want to use with the wedge, so i guess the 2" APM Version is suitable?
Since i already have the energy reduction D-ERF coating of the scope i would like to go a more economic direction.

Thanks
Dennis
I would go 2", you have better thermal loading.

I would recommend a wedge that you can remove the ND filters from so that you can get the shortest possible exposure time.


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Re: Which Herschel Wedge with C9.25?

Post by Dennis »

Thanks Mark, i was wondering if i need a 2" since about 90% of the heat is taken off with the D-ERF.

@Christian: i checked again and i noticed that the Airylab Hat has a different erf-bandpass then the baader triband. My triband has actually a ~50nm window around 500nm. Im wondering if it might be too much energy for the OIII or the camera without any prefiltering. Im not sure.


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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Re: Which Herschel Wedge with C9.25?

Post by christian viladrich »

Hello Denis,
Are you using a C9.25 with a D-ERF or a Triband C9.25 ?


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http://planetary-astronomy.com/
Editor of "Solar Astronomy"
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Re: Which Herschel Wedge with C9.25?

Post by Dennis »

christian viladrich wrote: Fri Jul 01, 2022 5:57 pm Hello Denis,
Are you using a C9.25 with a D-ERF or a Triband C9.25 ?
Good morning Christian,

im using a Triband C9.25, im now imaging in whitelight, with the configuration like you said. It works nicely and nothing seems to burn :lol:
I decided to use my baader 10nm OIII (visual) Filter first, so far it works well.

Thanks again for the info.
Dennis
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Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
Firochromis
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Re: Which Herschel Wedge with C9.25?

Post by Firochromis »

Hi, just a novice question. What is the usage of the OIII filter in this setup? Is it commonly used in Herschel wedge setups?

Thank you.


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Re: Which Herschel Wedge with C9.25?

Post by Dennis »

Firochromis wrote: Wed Jul 13, 2022 9:27 pm Hi, just a novice question. What is the usage of the OIII filter in this setup? Is it commonly used in Herschel wedge setups?

Thank you.
Hi, its to get more contrast in whitelight imaging. An OIII has its window at around 500nm but it is only ~10 nm wide. The narrower the bandpass, the higher the expected contrast.

500nm is not as seeing demanding as 390nm, thats why its more popular i guess. I dont know if its popular with Herschel setups, but i dont think its "exotic". But since most OIII filters are for visual use they usually come in a 2" format. And for to use this you either need a 2" Herschel or adapter to use it.


Triband C9.25
H-a: Quark Chromosphere with BF mod
WL: Antlia 500nm/ 3nm, 393 nm/ 3nm
Ca-K: homebrew (includes 2x 1.5A filters, thanks Apollo)
Player One Apollo Max + Mars MII
Barlows:
-2x Gerd Düring 2.7x
-2x TMB 1.8x
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