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Jochen S. · 06-04-2022, 03:56 AM

I have got a problem with my K-3:
The Auto ISO function worked well in every mode.
But now it only works in the green mode and TAv mode, but refuses in Tv and Av.
Maybe I changed a setting unintended, but I cannot find a suitable menu item.
Can anybody give me an advice?

pschlute · 06-04-2022, 04:39 AM

What lens are you using ? Might be worth giving the contacts a good clean. The camera needs to know the lens for auto ISO to work.

**tabz** · 06-04-2022, 06:36 AM

Originally posted by Jochen S.

I have got a problem with my K-3:
The Auto ISO function worked well in every mode.
But now it only works in the green mode and TAv mode, but refuses in Tv and Av.
Maybe I changed a setting unintended, but I cannot find a suitable menu item.
Can anybody give me an advice?

How should work auto iso in Tv or Av?

AfterPentax Mark II · 06-04-2022, 07:15 AM

Originally posted by Jochen S.

I have got a problem with my K-3:
The Auto ISO function worked well in every mode.
But now it only works in the green mode and TAv mode, but refuses in Tv and Av.
Maybe I changed a setting unintended, but I cannot find a suitable menu item.
Can anybody give me an advice?

Auto ISO is not readily available in Tv and Av, you can see that on the screen. For use with Tv and Av you have to push the green button and on the right side at the bottom you"ll see appear Auto Iso. This is what I must do on my K-3.

C_Jones · 06-04-2022, 02:09 PM

In TAV mode, the user sets the shutter and aperture both manually, while the camera automatically figures the ISO. It is in that mode that auto ISO is an objective. You can also adjust the EV (exposure value) while in TAV mode to give the image outcome less or more exposure than is being figured by the camera. If the EV is adjusted while using TAV, the ISO may change to adjust to that setting also.

Jochen S. · 06-04-2022, 03:11 PM

Originally posted by pschlute

What lens are you using ? Might be worth giving the contacts a good clean. The camera needs to know the lens for auto ISO to work.

Thank you for your advice.

In my case the problem did not depend on a certain lens.
Meanwhile I could solve the problem by making a reset in the set-up menu.
The Auto ISO function is working again.

Jochen S. · 06-04-2022, 03:13 PM

Originally posted by tabz

How should work auto iso in Tv or Av?

When the camera notices that the combination of exposure time and aperture causes a too dark picture or critical long expusure time the camera rises iso sensivity.

Jochen S. · 06-04-2022, 03:16 PM

Originally posted by AfterPentax Mark II

Auto ISO is not readily available in Tv and Av, you can see that on the screen. For use with Tv and Av you have to push the green button and on the right side at the bottom you"ll see appear Auto Iso. This is what I must do on my K-3.

Thank you for your advice.

In my case it was different. The screen told me Auto ISO is working but it did not.
The function of the green button can be choosen in another menu item.
Meanwhile I could solve the problem by making a reset in the set-up menu.
The auto-iso function is working again.

---------- Post added 06-04-22 at 03:28 PM ----------

Originally posted by C_Jones

In TAV mode, the user sets the shutter and aperture both manually, while the camera automatically figures the ISO. It is in that mode that auto ISO is an objective. You can also adjust the EV (exposure value) while in TAV mode to give the image outcome less or more exposure than is being figured by the camera. If the EV is adjusted while using TAV, the ISO may change to adjust to that setting also.

Thank you for your advice.

In TAv mode the Auto ISO function worked properly.
The problem occured in Tv and Av mode.
Meanwhile I could solve the problem by making a reset in the set-up menu.
The Auto ISO function is working even in Tv and Av mode again.

pevik · 06-10-2023, 02:02 PM

Originally posted by Jochen S.

Thank you for your advice.

In my case the problem did not depend on a certain lens.
Meanwhile I could solve the problem by making a reset in the set-up menu.
The Auto ISO function is working again.

I had the same problem and figured it out. Next time when this happens, just press "ISO" (you should be able to change ISO now with wheel). Don't use wheel, press "green" (or white in case of Monochrome

) dot button. This should bring your ISO to auto mode.

Jochen S. · 06-11-2023, 12:15 PM - **1 Like**

Thank you for your advice.

CambridgeDon · 04-01-2024, 03:01 PM

Originally posted by AfterPentax Mark II

Auto ISO is not readily available in Tv and Av, you can see that on the screen. For use with Tv and Av you have to push the green button and on the right side at the bottom you"ll see appear Auto Iso. This is what I must do on my K-3.

Thanks, that also worked on the K-3 monochrome

06-04-2022, 03:56 AM	#1
Jochen S. New Member Join Date: Jun 2022 Posts: 5	K-3 Auto ISO function with problems I have got a problem with my K-3: The Auto ISO function worked well in every mode. But now it only works in the green mode and TAv mode, but refuses in Tv and Av. Maybe I changed a setting unintended, but I cannot find a suitable menu item. Can anybody give me an advice?

06-04-2022, 02:09 PM	#5
C_Jones Pentaxian Join Date: Sep 2012 Location: NY Photos: Gallery \| Albums Posts: 6,084	In TAV mode, the user sets the shutter and aperture both manually, while the camera automatically figures the ISO. It is in that mode that auto ISO is an objective. You can also adjust the EV (exposure value) while in TAV mode to give the image outcome less or more exposure than is being figured by the camera. If the EV is adjusted while using TAV, the ISO may change to adjust to that setting also. Last edited by C_Jones; 06-04-2022 at 02:21 PM.

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06-04-2022, 04:39 AM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,217	What lens are you using ? Might be worth giving the contacts a good clean. The camera needs to know the lens for auto ISO to work.

06-04-2022, 06:36 AM	#3
tabz Site Supporter Join Date: Sep 2009 Photos: Albums Posts: 42	Originally posted by Jochen S. I have got a problem with my K-3: The Auto ISO function worked well in every mode. But now it only works in the green mode and TAv mode, but refuses in Tv and Av. Maybe I changed a setting unintended, but I cannot find a suitable menu item. Can anybody give me an advice? How should work auto iso in Tv or Av?

06-04-2022, 07:15 AM	#4
AfterPentax Mark II Pentaxian Join Date: Mar 2021 Posts: 1,467	Originally posted by Jochen S. I have got a problem with my K-3: The Auto ISO function worked well in every mode. But now it only works in the green mode and TAv mode, but refuses in Tv and Av. Maybe I changed a setting unintended, but I cannot find a suitable menu item. Can anybody give me an advice? Auto ISO is not readily available in Tv and Av, you can see that on the screen. For use with Tv and Av you have to push the green button and on the right side at the bottom you"ll see appear Auto Iso. This is what I must do on my K-3.

06-04-2022, 03:11 PM	#6
Jochen S. New Member Join Date: Jun 2022 Posts: 5 Original Poster	Originally posted by pschlute What lens are you using ? Might be worth giving the contacts a good clean. The camera needs to know the lens for auto ISO to work. Thank you for your advice. In my case the problem did not depend on a certain lens. Meanwhile I could solve the problem by making a reset in the set-up menu. The Auto ISO function is working again.

06-04-2022, 03:13 PM	#7
Jochen S. New Member Join Date: Jun 2022 Posts: 5 Original Poster	Originally posted by tabz How should work auto iso in Tv or Av? When the camera notices that the combination of exposure time and aperture causes a too dark picture or critical long expusure time the camera rises iso sensivity.

06-04-2022, 03:16 PM	#8
Jochen S. New Member Join Date: Jun 2022 Posts: 5 Original Poster	Originally posted by AfterPentax Mark II Auto ISO is not readily available in Tv and Av, you can see that on the screen. For use with Tv and Av you have to push the green button and on the right side at the bottom you"ll see appear Auto Iso. This is what I must do on my K-3. Thank you for your advice. In my case it was different. The screen told me Auto ISO is working but it did not. The function of the green button can be choosen in another menu item. Meanwhile I could solve the problem by making a reset in the set-up menu. The auto-iso function is working again. ---------- Post added 06-04-22 at 03:28 PM ---------- Originally posted by C_Jones In TAV mode, the user sets the shutter and aperture both manually, while the camera automatically figures the ISO. It is in that mode that auto ISO is an objective. You can also adjust the EV (exposure value) while in TAV mode to give the image outcome less or more exposure than is being figured by the camera. If the EV is adjusted while using TAV, the ISO may change to adjust to that setting also. Thank you for your advice. In TAv mode the Auto ISO function worked properly. The problem occured in Tv and Av mode. Meanwhile I could solve the problem by making a reset in the set-up menu. The Auto ISO function is working even in Tv and Av mode again.

06-10-2023, 02:02 PM	#9
pevik Forum Member Join Date: Apr 2023 Location: North of Poland, Europe Posts: 98	Originally posted by Jochen S. Thank you for your advice. In my case the problem did not depend on a certain lens. Meanwhile I could solve the problem by making a reset in the set-up menu. The Auto ISO function is working again. I had the same problem and figured it out. Next time when this happens, just press "ISO" (you should be able to change ISO now with wheel). Don't use wheel, press "green" (or white in case of Monochrome ) dot button. This should bring your ISO to auto mode.

06-11-2023, 12:15 PM - 1 Like	#10
Jochen S. New Member Join Date: Jun 2022 Posts: 5 Original Poster	Thank you for your advice.

04-01-2024, 03:01 PM	#11
CambridgeDon New Member Join Date: Apr 2024 Posts: 2	Originally posted by AfterPentax Mark II Auto ISO is not readily available in Tv and Av, you can see that on the screen. For use with Tv and Av you have to push the green button and on the right side at the bottom you"ll see appear Auto Iso. This is what I must do on my K-3. Thanks, that also worked on the K-3 monochrome

K-3 Auto ISO function with problems

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