User Activity

Does canon make a 100-400 mm serie L lens that, does not push or pull for the distance to get the at 400 mmm?I love my 70-200 mmm that twist distance, does 100-400 mm serie L come that too or is it just push and pull model?
Our all ultra - voliet (uv) filters the same?
Which would be a better for wildlife and sport action Canon 70-200  mm is usm ii serie L f/2.8 or Canon 100-400 mm f/4.5-5.6?
Can you explain to me why the eos utility unable to download picture from the camera to the computer. I should like why canon is having this or is just the disk i have.
 What would be a good len for shooting sport action and wildlife photo.