ISO won't go below 200 in Tav mode

PixelPete · 09-24-2016, 10:44 AM - **1 Like**

I've set the auto ISO range to 100-51200, but in TAv mode, the ISO won't go below 200. The ISO reading flashes and the picture over exposes.

There must be a separate setting for this.

Any ideas?

--
Pete

vonBaloney · 09-24-2016, 10:49 AM

If highlight correction is on, minimum ISO is raised. Not specific to TAV.

Na Horuk · 09-24-2016, 11:32 AM

Yes, highlight correction blocks the choice of lowest ISO. However, it still uses that ISO, it just artificially raises the brightness of the photo while taking care not to blow the highlights. As it does this, the ISO "goes up" one stop. So if you have highlight correction and shoot ISO 200, the photo is actually taken at ISO 100.
I guess you have highlight correction enabled in TAv but maybe its disabled in the custom and Auto and Scene modes. Some settings are specific to the mode you chose

Adam · 09-24-2016, 02:45 PM - **1 Like**

Originally posted by PixelPete

I've set the auto ISO range to 100-51200, but in TAv mode, the ISO won't go below 200. The ISO reading flashes and the picture over exposes.

There must be a separate setting for this.

Any ideas?

--
Pete

If you set highlight correction to "auto" instead of "on", you shouldn't have this limitation

Adam
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PixelPete · 09-24-2016, 02:45 PM

Thanks Guys,
Yes, highlight correction is on Auto, so probably on. That must be the answer.

--
Pete

09-24-2016, 10:44 AM - 1 Like	#1
PixelPete New Member Join Date: Jul 2016 Posts: 12	ISO won't go below 200 in Tav mode I've set the auto ISO range to 100-51200, but in TAv mode, the ISO won't go below 200. The ISO reading flashes and the picture over exposes. There must be a separate setting for this. Any ideas? -- Pete

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09-24-2016, 10:49 AM	#2
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	If highlight correction is on, minimum ISO is raised. Not specific to TAV.

09-24-2016, 11:32 AM	#3
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	Yes, highlight correction blocks the choice of lowest ISO. However, it still uses that ISO, it just artificially raises the brightness of the photo while taking care not to blow the highlights. As it does this, the ISO "goes up" one stop. So if you have highlight correction and shoot ISO 200, the photo is actually taken at ISO 100. I guess you have highlight correction enabled in TAv but maybe its disabled in the custom and Auto and Scene modes. Some settings are specific to the mode you chose

09-24-2016, 02:45 PM - 1 Like	#4
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by PixelPete I've set the auto ISO range to 100-51200, but in TAv mode, the ISO won't go below 200. The ISO reading flashes and the picture over exposes. There must be a separate setting for this. Any ideas? -- Pete If you set highlight correction to "auto" instead of "on", you shouldn't have this limitation Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

09-24-2016, 02:45 PM	#5
PixelPete New Member Join Date: Jul 2016 Posts: 12 Original Poster	Thanks Guys, Yes, highlight correction is on Auto, so probably on. That must be the answer. -- Pete