I've only suspected seeing Lower's Nebula once from Coinjock NC using my 25" Dobsonian:
?
Lower's Nebula - Sh 2-261
(Bright Nebula in Orion)
Observed: Jan 19, 2014, 9:20:00 PM
I could barely see some slight brightening as I moved the scope. The OIII filter didn't help.?
Kent Blackwell