Feb 20
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How is one better than the other?
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The more expensive one is better, for a couple of reasons:
1. It’s an FX lens. Compared to the 18-200mm, the glass elements in the 70-200mm are physically larger. Larger lens elements are harder to make. The tradeoff is that you can’t really use the 18-200mm on an FX camera. The 70-200mm lens was designed to work on both.
2. It has a wider maximum aperture, a constant f/2.8 across its entire zoom range, compared to a variable f/3.5-5.6 on the 18-200mm. Lenses with wide maximum apertures need larger glass elements. Are we detecting a pattern here?
3. It’s a professional lens. It uses five extra-low dispersion glass elements, which are very difficult to make, it has internal focusing, three autofocus lock buttons, nine aperture blades for neutral bokeh (and 18-pointed sunstars!), and frankly the thing is built like a tank. Every nice, special, amazing feature you can pack into a lens like this, it’s got.
The bottom line has to be whether these extras are worth it to you. You almost always get what you pay for with lenses. If one costs twice as much as the next, there’s a reason. Only you can decide whether it’s a good reason.
Hope this helps!
hye, the answer is simple…. the first one is better one because of its aperture and also its size that is big which means its dedicated to zoom range shooting….Where else the second link is more used for easy carry purpose but also for good picture with stabilizers..If i were you , i would go for the first one …as i also did intense comparison about those 2 lens.
Hope this helps..
When given a choice, a fast lens is always preferable. If the lens is a zoom then a constant aperture is always preferable.
The 70-200mm f2.8 is 2/3 stops faster than the 18-200mm f3.5-5.6 when the 18-200mm is used at 18mm. Zoom to f5.6 and you lose 2 full stops. What does this mean? Lets look at a hypothetical example. Although you may never duplicate it in real life, the f-stop/shutter speed relationship (at a given ISO) is applicable.
Suppose we’re shooting sports and need both a fast shutter speed and a low ISO for the large prints we intend to make. So we’ll use ISO 100.
First, lets look at the 70-200mm f2.8. We want a shutter speed of 1/250 sec. and find that f2.8 gives us exactly that. Since the aperture remains a constant f2.8, our shutter speed doesn’t change as we zoom from 70mm to 200mm.
Now lets change to the 18-200mm f3.5-5.6 and see what happens. At 18mm (f3.5) our shutter speed drops to approximately 1/160 sec. We can probably use this effectively for most action. But now look at what happens when we zoom to 200mm. Our shutter speed drops to an unacceptable 1/60 sec. because f5.6 is 2 full stops slower than f2.8. Now we have no choice but to increase the ISO IF we want to get our shutter speed back to 1/250 sec. If we set our ISO at 400 we are back to our original 1/250 sec. shutter speed that we got with ISO 100.
My vote goes to the 70-200mm f2.8 lens. If you have the 18-55mm “kit” lens then you have pretty good coverage. Later on, you can always add a wide angle if you need more coverage than the 18mm gives you.