Bandwidth choices for narrowband imaging with fast optics [4k]

I wanted to figure out if the cost of 6 nm filters was worth it, so I compared the 6 and 12 nm bandwidth MaxFR filters from Astronomik. The results were not what I expected, and it took more than a month of reading and analyzing to figure out why. This video is longer than I planned, but realized there is a lot to understand that is not clear in most sales documentation about these filters. You can skip around and look at the results, but understanding why the results came out like this has influenced how I think about why and when to use specific filters on fast optics like HyperStar or RASA, or the Nexus reducer on a Newtonian.
These concepts apply to single-band and multi-band filters.
I think a lot of people quickly blame the filter for image artifacts when it is actually something else going on, I show how to figure this out.


Links:
Microlens Diffraction: https://www.cloudynights.com/topic/63...

Python Angle Calculations: https://github.com/gshau/fast_optics_...

Great resources:
http://karmalimbo.com/aro/reports/Art...

https://micro.magnet.fsu.edu/primer/j...

Chapters:
0:00 - Intro
2:05 - Hardware Config
4:05 - Acquisition and Processing
5:23 - Image Comparisons
6:53 - Halo Images
10:10 - Halo Analysis
15:49 - Halo - Microlens Diffraction
20:08 - Nebula Signal Ha
26:05 - Nebula Signal OIII
29:13 - Star Size
29:51 - Image Summary
31:10 - Fast Optics and Dichroic Filters
33:36 - Blue Shift
34:54 - Calculated Angles
40:16 - More microlensing
41:42 - Conclusions