FYI -
I purchased the Triad Tri-Band filter. It took about 5 weeks to arrive because it was backordered and I was on a waiting list.
I took 3 hours worth of 9 min exposures on the Heart Nebula with the filter and my Canon T3 and a WO Star71 (Gen 2) telescope. The BYEOS histogram is shown in the first attachment. As expected (based on many calculations) the B/G channel histograms were at about 25% which is fine. For comparison, with the IDAS LPS-V4 filter I was only able to use 3 min exposures to achieve similar histogram readings.
I used the same PI processing workflow that I've been using for all my images with LP filters. I used PCC for color correction, and, colors came out very reasonable. Processing was easier than usual because the filter greatly reduces the LP gradient. The stacked image also had lower noise than with the IDAS LPS-V4 filter or the IDAS LPS-D1 filter for similar total exposure times, so, the image has nice details.
The filter/camera combination basically captures Ha and Oiii data, so, HOO processing is certainly an option.
The final processed image is shown in the second attachment.
I really like this filter so far. It produced a superior image to what I was able to capture in the past with the other filters. I have about 25 other targets already picked out. It's exciting to be able to capture better data from my high LP location. It's kind of a "poor man's" approach to NB imaging (although the Triad Tri-Band filter costs $775 for a 2" filter, so, not for the very poor!).
Steve
