Mike, thank you for sharing those images, especially the last two showing the stacking of images in PS. Some yucky weather out there yesterday, huh? But you got excellent images out of it .
The Black-eyed Snakes playing at the Cedar Lounge in Superior, WI. One of many side projects by Alan Sparhawk (of Low). All with the Voigtlander 35mm f/1.7 at f/1.7 (I think).
Experimenting with stacked teleconverters on the Canon 400L F/5.6
Used an EF 12II tube between the 1.4x and 2x TC, and the MBV to get an approximately 1100mm FL.
Shot on a beanbag, and my end wasn't all that stable. Could improve the quality a bit with a more stable platform.
Though not great, I think the IQ largely usable.