Hi Paul
I believe that you will still require an IR blocking filter based on my experience yesterday, Monday, as follows:
- I had the BAADER AstroSolar™ Density 3.8 Photographic only full aperture filter on the Vixen 4 inch and was experimenting with a newly acquired BAADER Solar Continuum filter.
- I removed the BAADER UV/IR cut filter from the ToUcam and replaced it with the BAADER Solar Continuum filter (designed to enhance the visibility of solar granulation and sunspot details). Well, the image was a mess; a big bright blob that would not resolve into any detail in spite of adjusting all the settings in K3CCDTools.
- I then re-fitted the BAADER UV/IR cut filter and this made a significant improvement.
- A little puzzled, I browsed the web and found the following at the Adirondack website:
“For digital imaging, we also recommend the Continuum filter be combined with our UV/IR Cut Filter (to completely cut the defocused far infrared wavelengths)”.
So, I suspect the answer is yes, you do need a UV/IR cut filter as well as the BAADER AstroSolar™ filter.
Not what you wanted to hear old bean!
Cheers
Dennis