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200-400+d3=200f/2???

zuman

US
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zuman Registered since 04th Jan 2006
Tue 25-Sep-07 08:52 PM

Ok, there might be a little hyperbole here, but someone on dpreview asked why people were buying a D3. I answered that it made my 200-400 f/4 into an f/2 (based on the assumption and approximation that ISO 1600 on the D3 is at least as good as ISO 400 on my D2x). I was then challenged by someone who said that while the f/2 equivalency may be close for exposure, an f/4 lens doesn't match an f/2 in depth-of-field.
That's correct, of course, but I then rolled out the old DOF calculator and discovered that if I shoot a subject 100' away with the 200mm f/2 at f/2 with my D2x, the DOF is about six feet. If I shoot the same subject at the same distance with my 200-400mm (at 300mm) at f/4, the DOF is about eight feet, which is pretty close over a 100' distance.
The 200mm f/2 is a lens I've always lusted over. In all honesty, I know that my 200-400 just couldn't match it regardless of which body it's attached to, but it still feels good to know that the D3 + 200-400mm combination can come pretty close to the exposure and DOF characteristics the 200 f/2 would have on my D2x.

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