rjk55425
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I am a recent convert to Nikon and use a D700. Over the years, I have I run a standard series of tests with all my lenses, shooting wide open and one stop down at the wide and telephoto ends of the lens. I have seen something with the 28-70 that I have never seen before in any other lens tested and not sure if its a major concern since its most visible when viewing at 100%. The lens is sharp enough wide open at both ends but when I photograph small print, the color of the font is not right at f2.8, kind of purple, at high contrast edges.
Everything looks as I would expect at 28mm, here are 2 shots at f2.8 and f4.0:
But the results are very different at 70mm, these 2 shots are also at f2.8 and 4.0. You don't see this problem as dramatically in the larger text above the small print put there is a faint purple edge around the text. It does improve when stopping down but is definitely visible in shots at 2.8:
Now in this series of shots, you can see the purple fringing around the Nikon letters but it disappears at f4:
And when I shoot larger text, its less noticeable (again f2.8, then f4):
I was hoping this issue would be less noticeable with real world shots but it is visible at 100% viewing, this is f2.8 at 70mm:
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to the more expensive 24-70 for the nano hype
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this is true. However, I buy a lens for a paticular purpose and don't worry about over-lap or gaps. To me a 24-70 is a mid-range or street zoom used for just about everything under the sun. When I'm using such a lens, I'm often in a situation where switching lenses is not an option.