birdsasart
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rscheffler wrote:
The next bunch of shots probably don't really show off anything that can't be done with other long lenses. But what made this quite fun was I could stand at the outlook point with just the 200-400 and a couple TCs and that was it, pulling in various compositions without the need for multiple lenses or a lot of cropping in post.
For these, the atmospheric distortion was already great enough that whatever quality drop the external TCs contributed in addition to the internal TC, including stacking the 1.4x and 2x with the internal TC engaged, was fairly minimal. With all three TCs though, barrel distortion was quite strong (+10 correction), as was CA, though it cleaned up very nicely in LR4.
Of course the question is why not just use an external 2x? At least for me, my habit is to rarely use the 2x, at least for sports applications. 1.4x has always been more versatile and always in the bag. This way I can shoot at up to 560mm and f/5.6 if I want to, then add another 1.4x to hit the limitation at f/8 of a single AF point. If I just went straight to a 2x, then I'd immediately be at f/8 with that AF limitation and sacrificing an extra stop when I might not actually need that much reach....Show more →
I gotta say that the sailboat image with the pink sky is drop-dead gorgeous.
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It's discouragingly reminiscent of when my 24-70 f/2.8 II was on back order for 5 months last year 
