The CenterLine filter wheel uses two independent wheels, each has 5 slots. They overlap in the middle, so you are always shooting through two filter slots. You typically never want to shoot through two filters, so you leave one slot in each wheel empty. All of the possible combinations of the two filters overlapping is one “slot” for the wheel. The first 5 slots are LRGB-Blank. Then the next 27 slots are all of the remaining combinations of the two wheels. The end result is that you need I need to use the first 17 “slots” (combinations) in order to get to each individual filter (I’m using the same filters everyone else is - LRGB and Ha O3 S2 - nothing special, just 50mm astrodons for a 16803 proline). The reason the CenterLine is designed that way as I understand it is so it doesn’t introduce an imbalance in the image train. Its center of gravity is closer to the optical axis than with other oblong/teardrop shaped filter wheels.
Anyway… It sounds like this might prevent me from using the software for now, until this filterwheel is supported. I’m a little surprised. I wouldn’t think that I was the first one to try to use this filter wheel with SGP.
EDIT: I didn’t answer your question - yes this is just casual AP using a portable setup in my backyard. I’m using a TeleVue 127FLI scope, which is designed around the FLI Proline camera, CenterLine filter wheel and Atlas focuser.
EDIT2: here’s a link to the FLI page that discusses the centerline: http://flicamera.com/cfw/index.html