TAv mode — do you use it?

I use it quite regularly - it's a good tool to have.  A disadvantage is that you can overexpose if you're not careful... e.g. set 1/125 and f/8 and forget about it, but if the sun comes out you might need ISO 50 or 25 and as those aren't available the shot is overexposed by 1 or 2 stops.  Yes there is a small warning flashing somewhere but it's easy to miss if you are concentrating on framing the shot.  I use TAv mode most for shooting moving things (like kids) in relatively poor light - so I'd set (say) 1/500 sec and lens wide open, and let the ISO float as it wants.  That works very well.

Best wishes

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Mike
http://www.pentaxphotogallery.com/artists/mikeward