I will be making a few trips to the quad cities this winter to photograph the eagles that hang around the dams. I've used a borrowed 600mm the past two seasons and found it hard to maneuver and sometimes too long. I can afford to purchase a 300 F4 IS or a 400 5.6. I only go out when the sun is shining so low light is not an issue.
What are your thoughts about using the 300 with a 1.4 tc or the 400? Actually I suppose I could also put the tc on the 400 as well since I can shoot at F8 in that light.