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TAv mode vs. M mode with auto ISO...

Somanna Muthanna , Mar 06, 2009; 10:39 p.m.

What is the difference between the two? Why is there a mode that is basically (my understanding) Manual mode with auto ISO? When I can just choose auto ISO in regular M mode?
Any frequent users of the TAv mode? I don't think I've actively chosen that mode to take a photo... ever. That and the Sv mode. So why is there a TAv mode and how do you explain it (and the benefits)?
Thanks guys.

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Haig Tchamitch , Mar 06, 2009; 10:46 p.m.

The TAv mode essentially allows you to set the shutter speed, and the aperture while the camera adjusts for the exposure using the ISO. Let's say that you are shooting some kids playing.. so you need the shutter speed to be at 1/250, and you also would like a shallow depth of field so as not to get background clutter.. so you set your aperture at f4. At this point these are constants with the Tav mode.. and as the light changes the camera compensates with the ISO to get the proper exposure.
The Sv mode just sets your shutter speed to be a constant, and your ISO is set by you, the camera adjusts the aperture to get the proper exposure.

Michael Elenko , Mar 07, 2009; 12:20 a.m.

Nice summary Haig. I rarely use TAv or Sv, preferring Av and M in that order with ISO 400 as the baseline. But my shooting partners go gaga over the TAv capability on my Pentax. It's the greatest invention since autofocus to them. I think that if I hadn't imprinted on film so long ago, I would view ISO as a main variable that they do.

ME

Trent Whaley , Mar 07, 2009; 12:30 a.m.

Well, one major benefit is having a separate dial setting for TAv so you don't have auto-iso turned on in Manual mode when you think you're in full-manual mode.

PJ Vesterback , Mar 07, 2009; 03:17 p.m.

Haig... you have described Sv mode incorrectly. You set your ISO and the camera adjusts the shutter and aperture accordingly.

Haig Tchamitch , Mar 07, 2009; 05:31 p.m.

You are right Patrick.. I meant to say Tv mode..

Ben Pajuczok , Mar 07, 2009; 09:35 p.m.

After reading this I think I will have to give this setting a go as I can see its uses now where as previously I just skipped over this setting.

Javier Gutierrez , Mar 08, 2009; 12:13 a.m.

I use TAV mode allot, but do not use the auto ISO. I just don't trust it. I like having the aperture, shutter and EV controls in my hands.

Somanna Muthanna , Mar 08, 2009; 02:34 p.m.

Javier, isn't TAv mode with auto iso then? I'm not sure what you mean when you say use TAv mode, but don't use the auto ISO...

Javier Gutierrez , Mar 08, 2009; 03:28 p.m.

Somanna, Yes, I set the high and low ISO to the same setting. Really I could do the same in Manual but being in TAV mode is cool since tha canikon folks I run into don't have that setting. :-)


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