Quote:
Originally Posted by milkpowder /img/forum/go_quote.gif
I have a general question. Why get two-three lens to cover the same range when you can use just one lens? I was just chatting casually to a friend who is into photography and he told me he is waiting for a Nikkor 14-24 and a 24-70. He currently has a 70-200 VR, which means that he'll have 14-200 covered. Couldn't you do that with just one lens, eg 18-200, give or take a few mm.
Another question. This friend of mine also said that 50 (or was it 75 or 85mm?) is close to the natural field of vision of a human being. Is that true?
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On a DX camera, it is either the 50mm or 35mm that is close to what we see. For me at least. How can you check? Keep both eyes open and focus on something. Bring the viewfinder in front of one eye. Change the focal length until the picture you see in the viewfinder nicely overlaps with the image you see in the other eye (ie, make them the same size visually).
Why get multiple lenses? Well one thing is for sure, you loose the convenience factor! However, they are better lenses in general. They will take, in general, sharper pictures, may have more saturated colors, can open up to wider apertures (fixed minimum f-stops), and will probably have less barrel distortion.
The 18-200VR is no shabby lens. It covers a very wide range, with VRII, is small, somewhat light, etc etc. But it lacks the low f-stops (3.5 vs. 1.8 for example) and will have a little barrel distortion near the extremes. For 800$ it's a great lens, but it is bested by some of these pro lenses.
Once you try your first good pro lens (either 1 of the three you mentioned, or a fixed focal length), you'll see the difference right off the bat.