What is the X?

13 years 6 days ago #46684 by hawkfly
How much x does a 70-300mm have? 50x zoom?


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13 years 6 days ago #46685 by B02 B05
4x

It's simple ... 300 divided by 70 = 4


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13 years 6 days ago #46686 by hawkfly
That's it? That is simple. Why didn't I ask this question a while ago. I wouldn't have been racking my brain all this time. lol


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13 years 6 days ago #46687 by B02 B05

hawkfly wrote: That's it? That is simple. Why didn't I ask this question a while ago. I wouldn't have been racking my brain all this time. lol

:rofl: Because we rather stress about trying to get the answer before we submit ourselves to ask a question.


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13 years 6 days ago #46688 by IO0R
That's correct. The 'X' factor is the range of the zoom. So a 12x zoom isn't neccesarily longer than a 10X zoom...is just has more range.
The zoom 'x' factor is commonly used in digi-cams with a built in lens...but not SLR lenses.
For SLR lenses, they use the focal length and that should give you a pretty good idea of 'how much zoom' you will get.

A greater zoom range is more convenient but compromises must be made. As a general rule, the greater the range, the lower the image quality. Top quality SLR lenses usually don't go over 4 or 5X.


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