It's handy for closeup work, too. In the shot I posted recently
http://www.jfwaf.com/PAW/PAW.php?name=PAW0703
I wanted f/11 for depth of field, and a shutter speed of 1/25s
(still pretty slow for hand-held at 105mm; shake reduction helps).
That turned out to require ISO 400, but I didn't have to think
about it - I have the auto-ISO range set from 100 to 640.
As I shifted viewpoint slightly, looking for just the right shot,
the light varied by more than one full stop, but I didn't have
to make any adjustments; the camera altered the ISO to compensate.
On Thu, Feb 08, 2007 at 06:29:34PM -0500, Paul Stenquist wrote:
> In TAv exposure mode, you set your f stop and shutter speed. You then
> specify a range within which the camera can change ISO. You can
> select the full range (100 to 1600) or a narrow range. The camera
> then changes ISO sensitivity as the light varies. Your stop and
> shutter speed remain constant. I find it wonderful when moving from
> sun to shade or when the sun is moving in and out of the clouds. It's
> also great indoors when moving from areas near windows to areas
> farther away, from brightly lit rooms to dimmer rooms, etc. The uses
> are many, and it works flawlessly in my experience.
> Paul
> On Feb 8, 2007, at 5:33 PM, J. C. O'Connell wrote:
>
> > what is the Tav exposure mode( how does it operate)?
> > jco
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> > Behalf Of
> > John Francis
> > Sent: Thursday, February 08, 2007 5:07 PM
> > To: Pentax-Discuss Mail List
> > Subject: Re: NO FS this Friday?
> >
> >
> >
> > It's one of those things that I wasn't particularly impressed by
> > when I
> > first saw the write-up on the camera. But once you've used it you
> > realise just how convenient it is.
> >
> > On Thu, Feb 08, 2007 at 06:34:47PM +0000, [EMAIL PROTECTED]
> > wrote:
> >> You're right, John. I now use TAv 75% of the time. It's a terrific
> >> feature. Paul
> >> -------------- Original message ----------------------
> >> From: John Francis <[EMAIL PROTECTED]>
> >>> On Thu, Feb 08, 2007 at 09:19:37AM -0800, Godfrey DiGiorgi wrote:
> >>>>
> >>>> But calling someone who wants to take advantage of pattern
> >>>> evaluative
> >>>> metering, linked AE and focus point, MTF prioritized exposure
> >>>> metering, automatic recognition of lens focal length for image
> >>>> stabilization, improved flare control, better image resolution,
> > high
> >>>> speed/accuracy focusing with fine manual control, etc etc, lazy or
> >
> >>>> incompetent is truly bullshit.
> >>>
> >>> Don't forget TAv mode - an amazingly useful innovation.
> >>>
> >>>
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> >>
> >>
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