.....good to see, Echosphere, thanks....do you compare and test Nikon Lenses for the university?....if so, do you think the picture quality with any AF Nikon zoom would be "as good" as AF Nikon fixed-lenses?....
In general, for comparative price/quality zooms these days are just as good or better than fixed lens.
Zooms got a bad wrap for a long time due to their image quality and crappy minimum f stop. These days with technology/computer CAD and new mineral lens coating, most of those issues have disappeared.
Mainly, the issue revolved around the fact that zooms need to utilize more glass elements, meaning, more physical pieces of glass in the lens. While a fixed lens might just have one or two, zooms could have up to 6 or more pieces of glass. Each piece of glass can lessen the image quality especially if they are not spaced right or have warped curvatures. Each of those imperfections would be magnified on the next piece of glass and so on.
Purists today, still like fixed lens for that reason, less pieces of glass (or "filters") for light to travel to the sensor/film. But with the tech today, that isn't so much an issue and zooms are now used by pro the world over.
Zooms generally, due to their design, have crappier minimum f stops compared to fixed lens. This used to be an issue with film cameras where most folks used 100 ISO/ASA speed slide film for landscape and shooting at dusk was a pain. Now, digital cameras have excellent high ISO sensitivity so f stops aren't as much as an issue.
I still prefer fixed lens, especially a 50mm 1.4 f stop on FX cameras. Why? Because zooms (for landscape shots) make you lazy. You can just stand there and zoom in and out. Fixed lens MAKE you get off the path, get closer get farther to get the perfect shot. Nearly all my favorite shots were when I got off the path and found a new perspective forced by the fixed lens. Though, if you shoot wildlife, a zoom many times is the only option, either you can't close enough to the subject before they get spooked or you only have a few seconds before they disappear.
