Lady Fraktor wrote: ↑Fri Apr 19, 2024 4:06 am
StarHugger wrote: ↑Mon Apr 15, 2024 8:49 am
The continuum filters wavelength is chosen though not for its colour alone but for the 540's ability at better atmospheric steadyness at that wavelength and your
refractors green centered colourband.
That should be eyesight instead of refractors.
Yes but a more inclusive yes and thanks for allowing me to continue Gabrielle as there is alot more to be said here indeed.
Its actually designed for 540nm...a refractors green centered colourband wich is also the center colour band for most colour cameras and our eyes it just so happens are most sensitive at that band.
So indeed even achromatic refractors will perform well both for imaging and visually with the continuum for this reason.
And it does indeed work quite well for visual as baader has permoted its use also for solar visual with a solar wedge and the proper additional filtering were required per "Your Specific Solar Wedge" Brand/Type/Model
It can almost as well be used with baader solar visual film or other visual solar films but Imho a Solar wedge serves up finer detail and is a much better and way safer option than solar film, so is a aluminum housed properly fitted dual surfaced white light glass filter Made by SolarSpectrum...my opinion.
For imaging with the continuum I suggest a mono camera, unless you are well versed in the extreme difficulties and pitfals of monochromatic colour solar imaging and its methods...
So actually all three, Eyes, refractors and cameras, Its the 540nm wavelength itself thats comes through our atmosphere less thermally discombobulated at that wavelength, and the 540nm frequency is being isolated and utilized here for filtering to take advantage of the steadier atmosphere there at 540nm.
Any green filter in general when added to the eyepiece for whightlight solar will work to a degree and in this order from best to least-Continuum/Wratten#56/Wratten#58...As well a colour camera with its blue and red exposure levels turned to zero will also have a steadying effect for solar whitelight imaging while using proper solar filtration...
In addition green filters also provide good sunspot to convection cell contrast visually and have been known and in use for both Solar visual and imaging applications for decades previous of baaders continuum designing, and it was this known use of green filters and blue and red colour imaging subtraction practices that led baader to its designing the continuum filter but initially for mono whitelight solar imaging is my understanding.
Hope this explains it all a bit better