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How to calculate zoom....
OK, I have to start by saying I have not actually used this product. However, I have to comment on the review that says Sony is falsely advertising a 40x zoom. Unfortunately, the reviewer does not understand what 40x means, and since this is likely true of many readers, I wanted to clear this up.
If you read the specifications, you will see that this Sony camera has a lens with a minimial focal length of 36mm and a maximum focal length 1440mm. To calculate the zoom multiplier, divide the maximum focal length by the minimum focal length. In this case, 1440 / 36 = 40 so indeed the Sony camera has a 40x lens.
So, what happened when the reviewer "GAB" went to the video store and compared this to the JVC and other models? The answer is, he only compared the maximum zooms of the different cameras. The JVC, for instance, turns out to have a greater maximum zoom. JVC's camera specs for this model indicate it has a minimum focal distacne of 2.3, and a maximum of 78.2. You can't really compare the focal length numbers since the cameras are on different scales, but you can apply the same formula to the JVC, in which case 78.2 / 2.3 = 34, so indeed the JVC has a 34x zoom, as advertized. However, to completely compare the lenses, you should also zoom ALL OF THE WAY OUT, and compare those pictures as well. If you do this, you will find the Sony gives a much wider view than the JVC. In other words, the Sony has a wider angle lens than the JVC. So, if you are close to the subjects you are viewing, you will get much more in the picture with the Sony than with the JVC.
The bottom line is that zoom multipler on any camera lens is the ratio of the widest angle to the strongest zoom. Which is more important is up to you. Do you plan to shoot more indooors than out? In that case, a wider angle is probably better due to the close quarters. Do you plan to shoot lots of sporting events from the bleachers? In that case you probably want a greater zoom to get close to the action from a distance. Some of of both? You probably want greatest flexibility, which in this case the Sony gives you slightly more.
Consider how you plan to do most of your shooting, and buy the camera that meets your needs. But make sure you are comparing apples to apples, and considering all aspects of your decision. Zoom is only one of many features on these cameras - compare them all!
Note: Since I have not used this camera, but I had to select a rating for it in order to write this, I choose four stars in order to average with GAB's rating of 2 stars and end up at 3. I apologize is this is misleading to anyone.
December 2007 · Electronics