| El Sid |
| (Going potty) |
| 20/06/2008 09:17 |
|
Re: AS-S Nikkor 18-70
|
Quote:
Or are they something to do with how the zoom affects the f/xx??
Yes. Many, if not most, zooms do not have constant maximum apertures (which tends to be a feature limited to the 'best' lenses) and normally the effective aperture is smaller at the longer end of the lens. As a sort of rule-of-thumb the wider the maximum aperture and the smaller the variation the better the optical performance of the lens is likely to be (though it's no guarantee), the price also tends to go up too.