Solar Spectrum Filter. What is needed to make it work?
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Solar Spectrum Filter. What is needed to make it work?
All,
I have a close friend who is considering a Solar Spectrum filter for his apochromatic refractors. I need to know a few things to help him. Does it require a barlow or powermate to increase fl to f30 for a parallel light beam into the etalon? Also is it like the DayStar Quark requiring an ERF at least above 80mm aperture?
What is needed to make this work?
James
I have a close friend who is considering a Solar Spectrum filter for his apochromatic refractors. I need to know a few things to help him. Does it require a barlow or powermate to increase fl to f30 for a parallel light beam into the etalon? Also is it like the DayStar Quark requiring an ERF at least above 80mm aperture?
What is needed to make this work?
James
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Re: Solar Spectrum Filter. What is needed to make it work?
It would be to bad to use a SolarSpectrum filter without a telecentric system. Baader makes TZ-2, TZ-3 and TZ-4. The choice depends on the native f-ratio of the refractor.
What is the diameter of the refractor used ?
What is the diameter of the refractor used ?
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Re: Solar Spectrum Filter. What is needed to make it work?
Hi James,
Yes - but avoid a Barlow or Powermate and instead get a real telecentric lens system to give it at least f/30 (Baader or BelOptik), and an ERF above 80-100 mm is highly desirable. FYI, telecentric systems do not produce parallel light to an etalon (that is more applicable to a collimator system), rather they provide very narrow converging light cones to the filter to reach near the specified filter band-pass.
See Christian Viladrich's treatise here, section F is the Summary.
The Baader DERFs are superior in providing both UV and IR blocking (and optical quality) - especially if it is a high-end APO. No sense in being penny wise and dollar foolish at this level of filter and telescope expense.
Yes - but avoid a Barlow or Powermate and instead get a real telecentric lens system to give it at least f/30 (Baader or BelOptik), and an ERF above 80-100 mm is highly desirable. FYI, telecentric systems do not produce parallel light to an etalon (that is more applicable to a collimator system), rather they provide very narrow converging light cones to the filter to reach near the specified filter band-pass.
See Christian Viladrich's treatise here, section F is the Summary.
The Baader DERFs are superior in providing both UV and IR blocking (and optical quality) - especially if it is a high-end APO. No sense in being penny wise and dollar foolish at this level of filter and telescope expense.
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Re: Solar Spectrum Filter. What is needed to make it work?
The largest is a Tak FS102. F8. He hopes to be able to use the filter on all four of his scopes.
The shorter fl scopes will take a more powerful telecentric?
The shorter fl scopes will take a more powerful telecentric?
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Re: Solar Spectrum Filter. What is needed to make it work?
Hi James,
Be sure to read the link to Christian's site. I'd go with the Baader TZ4, which will give you f/32 with the Tak f/8. there generally would be no more "powerful" telecentric. I believe the TZ's were designed around an objective with an 800 mm FL, which is ideal for the FS102.
After the filter, you could use a telecompressor to re-establish a better EFR. I would use a Baader 110 mm DERF because the FS Tak is a fluorite, and thermal stability of the objective would be improved since fluorite has a large CTE.
Be sure to read the link to Christian's site. I'd go with the Baader TZ4, which will give you f/32 with the Tak f/8. there generally would be no more "powerful" telecentric. I believe the TZ's were designed around an objective with an 800 mm FL, which is ideal for the FS102.
After the filter, you could use a telecompressor to re-establish a better EFR. I would use a Baader 110 mm DERF because the FS Tak is a fluorite, and thermal stability of the objective would be improved since fluorite has a large CTE.
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Re: Solar Spectrum Filter. What is needed to make it work?
He may be inclined to use the TV85 more often. It’s f7 I think and could probably use the TZ4 telecentric.Bob Yoesle wrote: ↑Fri Mar 19, 2021 9:57 pm Hi James,
Be sure to read the link to Christian's site. I'd go with the Baader TZ4, which will give you f/32 with the Tak f/8. there generally would be no more "powerful" telecentric. I believe the TZ's were designed around an objective with an 800 mm FL, which is ideal for the FS102.
After the filter, you could use a telecompressor to re-establish a better EFR. I would use a Baader 110 mm DERF because the FS Tak is a fluorite, and thermal stability of the objective would be improved since fluorite has a large CTE.
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Re: Solar Spectrum Filter. What is needed to make it work?
I've been looking into solar spectrum as well, and something they told me was that the required F number depended on the filter rating. Filters rated for 0.5A needed f30, but those rated for 0.3A need f40, and that was something I wasn't aware of but that is good to know when working out what telecentrics and such to get.
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Re: Solar Spectrum Filter. What is needed to make it work?
The one we've looked at is 0.65A. It will give a good balance between proms and surface.ammonthenephite wrote: ↑Sat Mar 20, 2021 4:09 am I've been looking into solar spectrum as well, and something they told me was that the required F number depended on the filter rating. Filters rated for 0.5A needed f30, but those rated for 0.3A need f40, and that was something I wasn't aware of but that is good to know when working out what telecentrics and such to get.
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Losmandy AZ8 Alt/Az Mount
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Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
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Re: Solar Spectrum Filter. What is needed to make it work?
Hi James!
You can see how it works with my filter on a 8" Baader Triband SCT. You have the TZ3, SS 0.3A, the 0.4x Baader Telecompressor....
I do have a 0.6A Quantum (Del Woods etalon) filter. It works the same way. Very close to your SS 0.65 filter. And you will be more than happy with that filter. Great views and a magnificent prominence filter. On a high end filter (and telescope) always use a Baader DERF.
You can see how it works with my filter on a 8" Baader Triband SCT. You have the TZ3, SS 0.3A, the 0.4x Baader Telecompressor....
I do have a 0.6A Quantum (Del Woods etalon) filter. It works the same way. Very close to your SS 0.65 filter. And you will be more than happy with that filter. Great views and a magnificent prominence filter. On a high end filter (and telescope) always use a Baader DERF.
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Re: Solar Spectrum Filter. What is needed to make it work?
Hello,ammonthenephite wrote: ↑Sat Mar 20, 2021 4:09 am I've been looking into solar spectrum as well, and something they told me was that the required F number depended on the filter rating. Filters rated for 0.5A needed f30, but those rated for 0.3A need f40, and that was something I wasn't aware of but that is good to know when working out what telecentrics and such to get.
Here is the effective FWHM depending on nominal FWHM and f-ratio :
http://astrosurf.com/viladrich/astro/in ... FWHM-N.JPG
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
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Re: Solar Spectrum Filter. What is needed to make it work?
Thanks. That will give he and I an idea of what the correct setup looks like.
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