(Click to enlarge)
This image © Copyright 2018, Michael Fulbright
This observation took place at the 2005 Mid-Atlantic Star Party (MASP). Conditions were just perfect and I was really satidfied the GP/DX mount could guide for 10 minutes.
Telescope: Takahashi FS-60C + UV block filter
Mount: Vixen GP/DX
Exposure: Ha: 120 min (12x10 minutes unbinned)