Just throwing this out as a query to the many sages out there. Why do lenses need a battery in the camera to manually focus?
Found this out when I was playing with a TS-E 24 on my [very new] 7D2, which had it's battery in the charger. I thought there was something wrong with the lens; found out that any of my lenses [whether manual or AF], on either of my Canon bodies would not appear to focus through the viewfinder unless a battery was physically in the camera, even though the camera wasn't turned on.
Not a problem or complaint - just curious as to why this is. ???
Found this out when I was playing with a TS-E 24 on my [very new] 7D2, which had it's battery in the charger. I thought there was something wrong with the lens; found out that any of my lenses [whether manual or AF], on either of my Canon bodies would not appear to focus through the viewfinder unless a battery was physically in the camera, even though the camera wasn't turned on.
Not a problem or complaint - just curious as to why this is. ???