I asked:

>> why would anyone want this?

Zeus replied:

> can you find focus precisely, without mistake, on the images where
> there are a lot of tiny objects and the DOF is rathe deep? not me

Not me either, probably, I've never tried.  But I still don't understand why I 
would ever want to do this. When I'm taking an image I'm concerned with what is 
in focus and depth of field and a selectable focus point is one tool sometimes 
useful to achieve that.  Yet once I have taken the image I'm only interested in 
what it looks like and whether it is adequately sharp where it needs to be - 
what relevance does the selected focus point at the time of taking the shot 
have?

Maybe I'm thick, but I don't see what use this would be - there again don't let 
me discourage anyone who wants it and is prepared to put the time in to develop 
it.

Rgds,
Rob.

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