OK,so what's this something special on the Pentax FF?

Gerry Winterbourne wrote:

I've never understood the benefit here, Miles. DA lenses cover image circles from very tight to APS-C up to full coverage of 135-FF. The last thing I'd want is for my crop lenses to be automatically restricted to the tightest circle.

Apart from other considerations, think of all the posts over the years asking about a square 14x24mm sensor. You'd be able to use any DA lens like that.

Obviously, if the crop option existed I could turn it off. So I'm not saying they shouldn't do it, just that I can't see its attraction as regards affordability.

What I think would be much better - and relatively easy to implement these days - is an electronic overlay in the VF to aid composition by giving a custom-adjustable grid or blacked-out edge to mask the VF to what the particular lens covers.

Who knows, it might be possible to read the lens chip so the body automatically provieds the correct FOV (with user option for aspect ratio).

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Gerry
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First camera 1953, first Pentax 1985, first DSLR 2006
http://www.pbase.com/gerrywinterbourne