Great, comprehensive post – thanks!
Anyone out there has IS issues when mounted on a tripod?
Way back, the white L telephoto lenses with IS, when mounted on a tripod with IS enabled, ‘oscillated’ as the IS sensor would be in a ‘dead zone’ with no movement detected. This was fixed in latter versions of these lenses.
Recently, on an indoor existing light tripod setup, I had an issue with IS on with my EF 100mm f/2.8 L Macro lens. I used mirror lock and self-timer on my 1DX II. Stopping down several stops from wide open (with correspondingly longer exposure times) yielded decidedly increased blur – way more than diffraction effects. I thought perhaps some minor vibration in my floor was causing the increased blur with longer exposure times. I always walk away from the tripod during the 10-second self-timer countdown. Experimenting with turning off the mirror lock, self-timer and IS determined IS was the culprit.
Perhaps the EF L Macro lens’ ‘hybrid’ IS does not like to be mounted on a tripod?