Id go long and get the 600mm.
I have a 600 F4 and a 3002.8. Its really the perfect pair to have for wildlife photography.
I even find that the 600 is too short and often wish I had a bit longer glass. But I will add that the wildlife I shoot is really wild, which means getting in position in the dark, sitting still and waiting hours... sometimes with no luck.
If the wildlife you are shooting is more tame then you don't need the extra glass.
BTW... once you spend some time with a long lens it becomes second nature to find birds in flight. When I first started shooting 600mm i struggled to get a bird in the view finder... now its no problem at all. Just practice practice practice. (Also orienting your lens hood so that the knob is pointing straight up and in line with your hot shoe helps. you can look over the top of the camera and use these points as an open sight to align it with a bird, then as you move your eye to the viewfinder just tilt the lens up a little bit and you find what you are looking for....)
I have a 600 F4 and a 3002.8. Its really the perfect pair to have for wildlife photography.
I even find that the 600 is too short and often wish I had a bit longer glass. But I will add that the wildlife I shoot is really wild, which means getting in position in the dark, sitting still and waiting hours... sometimes with no luck.
If the wildlife you are shooting is more tame then you don't need the extra glass.
BTW... once you spend some time with a long lens it becomes second nature to find birds in flight. When I first started shooting 600mm i struggled to get a bird in the view finder... now its no problem at all. Just practice practice practice. (Also orienting your lens hood so that the knob is pointing straight up and in line with your hot shoe helps. you can look over the top of the camera and use these points as an open sight to align it with a bird, then as you move your eye to the viewfinder just tilt the lens up a little bit and you find what you are looking for....)
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