This doesn’t mean that if your telescope is F/2 (like my Celestron 8″ RASA), that it is not compatible with this filter, it just means that the images will have about an 0.8nm band-shift. It’s worth noting that the OPT website states that telescopes with focal ratios faster than F/4 will move the transmission off-band. If you are wondering what the breakdown of the bandpasses (in nanometers) are for this quad-band filter, here it is: The Triad Ultra filter was designed to be used primarily with color cameras, and I have found it to be an extremely useful DSLR filter. In theory, this creates images with more contrast and better separation between the H-beta and OIII channels. The “Ultra” version of the filter improves upon the previous tri-band version, now with an even narrower band-passes, and the inclusion of Sulfur II (SII). This is a 2″ quad-band narrowband filter that collects light in 4 bandpasses, Ha, OIII, SII, and H-Beta. I’ve been lucky enough to test the OPT Triad filter (Radian Telescopes) for astrophotography in the backyard.
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