1) Hubble Space Telescope 2.4m RC in space + WFPCII
2) Astrophysics 6" APO refractor on Earth (13000mm FL) + FLI ProLine 11002 (by Mike Sidonio)
3) ESO 2.2m RC on Earth + Wide Field Imager CCD
4) 20" Corrected Cassegrain from Earth + KAI11000 CCD (by Johannes Schedler)
Crops were taken from the original full frame higher resolution images here: