Here’s the result using the Canon 60Da on my little tracker head. I spent a lot of time fooling with these in Pixinsight and then Photoshop. Unusual for this part of New Mexico, I had problems with gradients due to smoke from wildfires in Arizona. (See https://www.jjmcclintock.com/?p=139) I believe this is stacked from 5-180 second exposures. Images were collected May 18, 2012.