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@dave.hallett , I have no problem with sharpness of my 10-24 at any aperture, even fully stopped down where I would/should experience diffraction.
EDIT
This is a 3-shot merge with the 10-24 at f11, through 3 filters.
Wain Wath, Swaledale by Stephen Lee, on Flickr
The 10-24mm is "Excellent" Sir, I've used mine both wide open and down to F11 without any sharpness problems whatsoever. It does soften up just a tad at the longer end (most zooms do) but is still extremely good and perfectly usable. In my user opinion the 18-55mm is a very good lens and should never be labelled a kit lens but optically the 10-24mm is sharper.
George.
Thank you both, gentlemen. Stephen there's certainly some nice fine detail there, I must agree. Particularly as the HDR process doesn't always help matters.
I don't usually bother with MTF charts, but a quick check on some reviews confirms my impression that the Tokina 12-24 is best at 5.6, and that the 10-24 should be very good at least to f/11. It looks as though some loss of central sharpness might be apparent at f/16 if you compared tripod shots, but I'm quite prepared to believe that it's still good enough for most purposes. This lens probably lies in my future...Just not the very close future