Yes, I do believe your understanding is correct. And yes, zooms with constant apertures are more expensive. Does the fact your camera has a constant aperture make it 'better'? Well, for point and shoots like your camera, that's pretty much the norm. Making a zoom with a constant aperture for camera like yours (one with such a small sensor) is a lot easier to make (thus cheaper) than one for DSLR sized sensors. You might technically have a 'fast' zoom ranged camera but your still at a disadvantage due to senor size. If these specifications are important to you, you ought to invest in a DSLR....
They usually let in a lot of light (f2.0), brighter lenses are more expensive, plus quality.End of RantTim..
With the point and shoot you could try putting it in a aperture priority mode and seeing how large and aperture it'll let you use on the long end to be sure. Sound an awful nice feature for a point and shoot, all the ones I've used have had variable zooms making the long end only useful in bright conditions..
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If these specifications are important to you, you ought to invest in aDSLR.... my two cents worth! Hope this helps..
Yeah, I'm working on that. My D40 is supposedly getting shipped today. .
BA baracus wrote:.
With the point and shoot you could try putting it in a aperturepriority mode and seeing how large and aperture it'll let you use onthe long end to be sure..
I mostly shoot in M, and the f2.8 is available all the way to the long end - still not great in low light, but at least I don't get slower...http://www.flickr.com/photos/jbphotogrl/..