Fris,
a 70-300mm lense will give you basically a lense you can change as if it acts like a lens with a mm of anywhere between 70 and 300.
The reason why people prefer a fixed lense instead of zoom is usually picture quality and light sensetivity which is better in fixed lenses usually. The longer the mm the bigger (wider) the lens has to be to keep the same light sensetivity. Thus a zoom will always be worse at it's highest setting compared to the lowest. A zoom also usually requires more seperate optical parts thus impacting image quality.
There are two things to look at in a lens: the mm and the f, f defines the ratio between length and width. The best you can usually get is 1:1.2 (sometimes written 1/1.2 or just 1.2). The smaller the 2nd number the more light the lense takes in but also the smaller the depth of field. Most lenses have around 1:3-1:6. A zoom lens will list f as a range since the longer it gets set to the bigger the 2nd number of course is.
Lenses increase in price rapidly the wider they are btw, especially zoom lenses.
Btw, Paul, I do most of my family photos with the canon 80mm 1:1.2 usm2. At least of my daughter when she plays, let's me do photos from a bit further away.
Quote:
Originally Posted by fris
whats the difference between having say a 70-300mm telephoto zoom
and
100mm standard/medium telephoto
or
200mm telephoto
or would the 70-300mm cover those 2
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