A commercial is not a review
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I used the Canon 400mm f/5.6 for a long time until I discovered what the Sigma 150-500mm could do. I've heard the Sigma 50-500mm is even sharper. I've moved on to the Sigma 300-800mm and Sigma 120-300mm f/2.8 but you should consider the 500mm zooms from Sigma at this price point. IS is unimportant if you shoot with a tripod or use a shutter speed of 1/focal length of the lens or faster. I have IS on the 120-300mm but I turn it off.I'm not sure where you heard that, but the (low-end) Sigma zooms are not even remotely close to the 400 5.6 - here's the 400 compared to the 150-500 compared @400mm, wide open:
The Canon is sharp from center to corners with just a hair of CA, while the Sigma is blurry mush with CA from mid-frame to the corners.
The Sigma 120-300 is a huge step up from the 150-500, but at 420mm with the Sigma 1.4x it's still not as sharp as the 400 5.6, even stopped down to 5.6:
The 120-300 is a fine lens, but if you want a sharp lens at 400mm, you can't beat the 400 5.6. The only lenses that are sharper at the focal length are the 300 2.8 IS II + 1.4x III ($7,299) or the 400 2.8 IS II ($10,999). Even the 200 2 IS + 2x III and 400 DO aren't as sharp.
The 400 5.6 is by far the best 400mm for the money and gives professional results.
Can't imagine you will regret that purchase. I love mine and it's size is perfect...lives on my 7D.
on a crop the 50 is going to be like shooting 80 its very tight in a reception
perhaps the sigma 30f1.4 is a better choice
I usually go with a 50f1.4 and 16-35f2.8 on FF bodies for the reception
now i just wish sigma would make a 50 f1.4 like their 85
I think we will eventually know, lol.
Think there is any chance any of the rebel line will have built in wireless flash control? One of the main reasons now I'm wanting to get a 60D or 7D is for the flash control.