problem solved: auto bracketing by shutter speed in manual mode

[PN Stenquist]

Some may recall that I couldn't get the K20D to auto bracket by  
shutter speed when shooting in manual exposure mode. Reading the  
Pentax manual and tinkering around, I remembered that the custom  
setting menu has a function called "Green button in TAV and Manual."  
This function allows one to choose between program line, aperture and  
shutter speed for exposure correction when the green button is pushed.  
I had it set to program line. Apparently it affects auto bracketing in  
manual exposure mode as well, although the literature doesn't say so.  
But changing it to shutter speed solved my problem.
Paul
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