I looked through my images recently and discovered that I have never done a monochrome image of M20. I have a fairly reasonable image done with the modded 40D. So with that in mind and whilst waiting for the return of the STXL I thought I would do the Trifid with the TSA102. I will do one with the RC12 if time permits this season once the camera returns.
This will most likely be the last deep sky image I take with the TSA as it is being retired for an FSQ. It has been a great scope but I want a wider field of view for some of the more extended objects out there.
One thing I noticed is that there is lots of very faint gas to the right of the nebula that I had not seen before. I wonder if this gas is Hb or is this really faint Ha? Maybe some of the learned out there can inform me.
Bottom right of the image is part of the Lagoon nebula I think.
Click here for the larger resolution