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TAv mode and ISO !??

stu49
Posted 03/05/2010 - 13:07 Link
Any way I can use the TAv mode on my K10, and maintain ISO 100 ?? It defaults to Auto and the minimum range u can set is 100-200 !!

Using it with flash, so plenty of leeway !!

Stu - K10D | DFA 100/2.8 Macro | DA 55-300 | AF-360FGZ |

So much to learn... So little time !
fatspider
Posted 03/05/2010 - 13:28 Link
I doubt it, the very nature of TAv is to allow the camera to choose the ISO after you have set Shutter and Aperture.

why not simply use manual and set the Shutter and Aperture you want along with ISO100 then you just have to compensate on the flashgun.
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stu49
Posted 03/05/2010 - 13:43 Link
fatspider wrote:
I doubt it, the very nature of TAv is to allow the camera to choose the ISO after you have set Shutter and Aperture.

why not simply use manual and set the Shutter and Aperture you want along with ISO100 then you just have to compensate on the flashgun.

Very true ! but when u use flash u add a 4th variable ! flash duration !!

So there's no need for iso to change !? would be handy, but maybe stick with manual !

Stu - K10D | DFA 100/2.8 Macro | DA 55-300 | AF-360FGZ |

So much to learn... So little time !
Anvh
Posted 03/05/2010 - 14:34 Link
Why not use manual then?
TAv with fixed ISO is manual mode after all.

Flash duration is near the 1/16000th of a Second, I don't think it matters much

The only way to control the flash is by these settings.
Flash-power - 1/1 is full 1/2 is one stop slower 1/4 is one stop slower again, ect.
Flash-distance - for every doubling you need twice as much light.
ISO - the difference of ISO 100 and ISO 200 is one stop the same between ISO 200 and 400, ect.
Aperture - is logical I believe.

Shutterspeed is the setting that balance things out, if you use long shutter speed more natural light comes in and vice versa.
Stefan
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K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Edited by Anvh: 03/05/2010 - 14:40

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