12-06-2018 09:55 AM
Yeah I get it. The great thing is the quality of the sensor. You can push the hell out of the ISO and still get high quality images with fast shutter speeds. Good luck with it and most of all have fun.
12-06-2018 10:15 AM
"I do know is that constant IS doesn't seem to be much of an issue as far as battery power."
I really don't think you have to worry about it at all. Just enjoy it. If it should fail because of not shutting off. its just a lens and can be repaired or replaced. The Sun will still come up in the morning.
01-23-2019 01:34 PM
If you have the EF 100-400mm L IS USM II there is a third position on the image stabilzation switch that turns the IS off EXCEPT during exposure. I am waiting for my 100-400mm to arrive. My understanding that turning this to position 3 also helps AF to operate faster. Just a thought.