I have now had a chance to experiment with focus bracketing. Attached is a processed image of an alium taken in my greenhouse to mitigate the effects of the breeze outside where the plant pot normally is. Details are:
Fuji x_t2 with 90mm prime lens, auto focus set on nearest (central part)
Tripod used with camera set to 10 sec delay
f2, 1/850s no filters, spot metering
Bracketing settings 30 images, step 5, interval 0
The distance from front to furthest visible part at the edge is 8cm (3.2") and camera to flower head is 1.2m (4 ft)
On reviewing the 30 images, approximately the first 20 covered focus from nearest to furthest visible points
JPEG mages with Velvia in camera simulation used.
All 30 images processed in Helicon Focus, just doing load, render, save.
Output image cropped in Lightroom, no other adjustments.
Resulting image downsized in Photoshop Elements 15 to LL specs for uploading.
My opinion: OK for me, may try with Raws, and do some Lightroom adjustments. Use of the focus bracketing function will require me to do more tests to get my head round how to judge optimum bracketing settings on the camera, but for me it does remove the need to manually adjust the focus point. I think it is a useful addition to the firmware and I will use it.
If anyone else has tried it, I'd be grateful to hear about the experience.