BIF- Cropping EF 100-400 L IS vs Tamron 70-300 SP VC Photos ?

Started Nov 21, 2012 | Discussions thread
Steve Balcombe
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Re: BIF- Cropping EF 100-400 L IS vs Tamron 70-300 SP VC Photos ?
In reply to Glenn_Sydney, Nov 22, 2012

Glenn_Sydney wrote:

How do you find the 70-300 L wide open at 300mm ? My Tamron needs to be stopped down to f8 to get nice and sharp.

The 70-300L is pin sharp at 300 mm f/5.6. The only reason I don't normally use it with the TC is that it makes an f/8 combination and on the 7D autofocus becomes unreliable. I did test it though, when I first had the lens:

1:1 crop

I've shown this image several times in discussions about this lens, but I still marvel at the clean pixel-level detail. It's hard to believe this is a 1:1 crop (and don't forget it's with a TC).

For what you might term 'casual' use, I would recommend the 70-300L over all the other options. Image quality is impeccable, focusing (without the TC) is superb, and the IS is twice as good as either the 100-400L or 300/4L IS. And it's more compact - there are many occasions when I carry this but wouldn't want to carry the bigger lens.

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