>Somebody hold my glasses, please. Hork, ptui.

GAK! [insert sound of bodily fluid striking eye]

>How could anyone possibly see the subtle nuances of the fringe area 
>between focus and out-of-focus looking at a silly chart or table? The 
>thing you are shooting is _right in front of you_. Look at it, focus, 
>touch the DOF button. What's the problem? Either the elements you want 
>to be in focus will be within the area of acceptable sharpness or they 
>won't.
>
>Let go of the button, refocus or adjust aperture if necessary and touch 
>DOF preview again. Takes a second.

Interesting point re macro work, as indeed others have said also.

The problem is that if I look down a viewfinder stopped down to (say) 
f/22 and activate DOF preview, the screen goes very dark. Fine you say, 
let your eyes adjust. I keep staring down this black hole waiting for 
something to happen - but it don't! The only way I can determine 
-briefly- a bit of DOF is by releasing and re-engaging (love that word) 
the DOF preview button quickly, which I'm sure makes a mockery of it's 
intended use.

Lens scales and charts and tables show the area behind and in front of 
the focus point that will be renedered in focus at a given aperture. 
Beyond or in front of those distances, it gets soft. Sort of a 'safe 
area' if you like. All I'm saying is that, for me, calculating distance 
works much better. What I'm asking is, for those who use the DOF preview 
TTL method, - - why? Thanks for taking the time to explain and hang a 
loogy ;-)

Cot

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