This may not be the right forum...
...but I just picked up a used Canon 100-400L at a good price and used it for the first time the other day while my Golden Retriever was doing what she does best. I like the extra reach over the 70-300L. Need to get more adept at the push-pull mechanism. But overall, I'm satisfied with the initial results.
|2014_1211_140657AA by old shutter bugger|
from The Bride
|Overloaded by NZ Scott|
from Your City - Delivery Boy
|Petals by Flor Tempra|
from Petal Portraits
|Barley by Will B Milner|
|APPLE & ROACH by TX Photo Doc|
from Delicious - Unpalatable