MONOPOD and IS:
As mentioned, IS on monopod of course.
If you intend to shoot a lot of panning shots, then go for mode 2.. otherwise mode 1 is fine.
TRIPODS and IS:
Please do not confuse turning IS off when mounted to a tripod as a rule of thumb!
Many of the best Canon IS lenses have a Tripod mode.. and IS can and should be left on in certain circumstances.
More info on this in the EF LEns FAQ .. the section about IS.
https://photography-on-the.net …d.php?t=86975#post1066324
hence, mode 2.

