Well, I do recall how well-regarded that FA* 28-70mm f/2.8 was back during 35mm film shooting days, and continues to be even now. I would just keep working with it. I never got one, as I own the Tokina 28-70mm f/2.6-2.8 Pro II and am very happy with it. However, I do own other FA power zoom lenses, and find this feature's design being to activate AF as it is zoomed, can bring exceptionally fast AF for moving subjects, though a bit noisy as it is continuously adjusting AF even though set to AF-S. Very fast and accurate- but you don't deal in moving subjects. This FA* lens is too good to ignore!
---------- Post added 01-21-23 at 04:14 PM ----------
Originally posted by texandrews
Due to the fine high iso performance of my K1mkII, the speed's not such a big deal to me anymore, and the longer FL of the 28-105 is more useful
This is one possibility, so that if conditions should warrant where WR is needed, a switch for that purpose could be made. Maybe worth consideration. I do like mine vey much.