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Finally I can do Calcium K imagingPurchased this from a US dealer in the US and made a filter for the front of my C8 using the enclosed filter material. The filter and film are designed for PHOTOGRAPHIC USE ONLY, no visual use. I have only done one test using the filter(s), the one you make that is a blocking filter on the front of the telescope and the Calcium K band filter which is attached in a 1.25 thread in front of a camera T-Mounted and placed in the eyepiece holder. I used a Point Grey Grasshopper 3 Five megapixel camera which is monochrome. The sun had some sunspot activity the first day I was able to test the filter and the filter brought out details in the image that were stunning. The image is likely better than any white light images I've taken but the front filter I created using the enclosed photographic film is a larger opening than my white light filters and photos have used. It's great to have a calcium K filter option that is affordable compared to older Calcium K telescopes. Baader also includes a warning in this, to NOT USE it visually. I figured it might be safe with Baader visual film and tried it with that film on a small scope but I think the Baader visual film blocks out the wavelengths that Calcium K could show. Most people cannot see Calcium K anyway and as Baader points out the Calcium K telescopes are dangerously close and radiation in that band is ikely dangerous to eyes anyway, So ALL CALCIUM K scopes should be used for photographic use ONLY, not just this filter.Greg K