First post, so I hope this is the correct forum.
Gear: T2i, Canon 70-300 4-5.6L and YN-568 mk I flash.
Problem: When zoomed below 200 or so, the flash follows the zoom of the lens, starting at 70mm and going to 105mm (the zoom's max). Then around 200mm, the zoom goes to 24mm and then 35mm at 300mm on the lens.
The metadata from the photos shows the correct mm reported from the lens, but the flash doesn't follow.
I tried with my other zoom 18-135, and the flash follows correctly.
This is my first month with a flash, so I'm not sure if this is correct behaviour or not.