I've grown quite fond of these ones in Carina:
IC 2448 - size= 9" , mag= 11.1
IC 2553 - size= 9" , mag= 13.0
IC 2501 - size= 2" , mag= 11.3
IC 2621 - size= 5" , mag= 10.5
All are extremely tiny but have a high surface brightness and is fun to pump up the mag trying to tease out details if you get good seeing. They should all be visible in a 4" scope.
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