lens question

[flea77]

Bokeh and the DOF (depth-of-field) used to separate a subject from the background, are not the same thing.

Quite correct, however using a 2.8 will result in a very small DOF which will throw objects a given distance more out of focus than the same focal length and same distance at 5.6. Additionally, as a general rule, a 2.8 lens will have better bokeh at any f-stop than a 5.6 lens.

Using a large aperture and the resulting shallow DOF can be problematic for a neophyte photographer using a camera that has rather limited auto focus capabilities (only 1 cross-type focus point for the D90).

No problems with a D90 or for that matter, D80, N90s or FG (manual focus of course) here with either 24-70 2.8 or 80-200 2.8. Of course I realize you said neophyte photographer, but everyone has to learn sometime.

The 24-70 f/2.8 ($1740, new) Allan mentioned is a popular lens with professional wedding photographers. An alternative would be the 24-85 f/2.8-4, at $700 if any were currently available new.

Or he could go with Sigma and save quite a bit, especially if he doesn't want to do this as a pro. For that matter, the Sigma 24-70 stacks up really well against the Nikon, assuming you get a good copy. I also believe that the Sigma 28-70 is cheaper still, and not bad either.

Just saying....

Allan