Here they are, the last set of filters needed for the filter upgrade. These are Astrodon Tru-Balance Hydrogen-Alpha and Oxygen-III 3nm narrowband filters.
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After moving on from my previous ATIK 383L+ to my new QSI 660i, I thought I would compliment the move with new filters. Everyone who has looked into them will know Astrodon filters tend to be very high-end, but also very highly-priced (depending on size). Thankfully, the move of CCD camera took me from a 17.6 x 13.52 mm Kodak KAF-8300 CCD sensor to a 12.48 x 9.98 mm Sony ICX694 CCD sensor. The diagonals here are very different, from 22.19 mm down to 15.98 mm. Additionally, my ATIK 383L+ had a backfocus distance of 17.5 mm whereas the QSI 660i has a backfocus distance of 14.6 mm. This means that not only is the CCD sensor on the QSI 660i significantly smaller, but the distance from it to the filters in the filter wheel is also smaller (a grand total of 27.1 mm in this case). What this does is imply that I can afford to use smaller diameter filters without introducing vignetting. However, I was not 100% sure until I tested them out.
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Archives
July 2019
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