Tv issues?

Chalky66 · 09-05-2021, 10:30 AM

Hi all.
A query about my K70. I set the dial to Tv and set the shutter speed to, say 400.When the image to be taken is bright, no problem. When the image is not so bright, instead of under exposing at set speed of 400, it drops it down to a slower shutter speed.

Am I missing something in the settings? ISO is set to 400 also.

Chalky

AfterPentax Mark II · 09-05-2021, 11:23 AM

Originally posted by Chalky66

Hi all.
A query about my K70. I set the dial to Tv and set the shutter speed to, say 400.When the image to be taken is bright, no problem. When the image is not so bright, instead of under exposing at set speed of 400, it drops it down to a slower shutter speed.

Am I missing something in the settings? ISO is set to 400 also.

Chalky

What lens do you use? If you use a lens with manual aperture setting, then you cannot use Tv and if you choose this setting it automatically reverts to Av. The result is that your shutter speed setting wiil be adjusted, because there is no aperture to adjust automtically.

pschlute · 09-05-2021, 12:52 PM - **1 Like**

Originally posted by Chalky66

When the image is not so bright, instead of under exposing at set speed of 400, it drops it down to a slower shutter speed.

At the point it drops the shutter speed...what is the aperture set to ? I imagine it is widest aperture. If you have auto -exposure adjustment set in the camera, then it will use a slower shutter speed.

If you want an underexposed image then turn it off.

stevebrot · 09-05-2021, 01:42 PM

Originally posted by pschlute

If you have auto -exposure adjustment set in the camera, then it will use a slower shutter speed.

Yep...meaning menu > C1 > Auto EV Compensation

Steve

Chalky66 · 09-06-2021, 12:28 AM - **1 Like**

Originally posted by AfterPentax Mark II

What lens do you use? If you use a lens with manual aperture setting, then you cannot use Tv and if you choose this setting it automatically reverts to Av. The result is that your shutter speed setting wiil be adjusted, because there is no aperture to adjust automtically.

The lens is 55-300 ED PLM WR.( Nice lens,by the way.) Just turned off Auto ev and it does as it should. Thanks for the info.
Mal

Chalky66 · 09-06-2021, 12:28 AM - **1 Like**

Originally posted by pschlute

At the point it drops the shutter speed...what is the aperture set to ? I imagine it is widest aperture. If you have auto -exposure adjustment set in the camera, then it will use a slower shutter speed.

If you want an underexposed image then turn it off.

Many thanks . It worked.

Mal

09-05-2021, 10:30 AM	#1
Chalky66 New Member Join Date: Oct 2020 Posts: 4	Tv issues? Hi all. A query about my K70. I set the dial to Tv and set the shutter speed to, say 400.When the image to be taken is bright, no problem. When the image is not so bright, instead of under exposing at set speed of 400, it drops it down to a slower shutter speed. Am I missing something in the settings? ISO is set to 400 also. Chalky

09-05-2021, 11:23 AM	#2
AfterPentax Mark II Pentaxian Join Date: Mar 2021 Posts: 1,461	Originally posted by Chalky66 Hi all. A query about my K70. I set the dial to Tv and set the shutter speed to, say 400.When the image to be taken is bright, no problem. When the image is not so bright, instead of under exposing at set speed of 400, it drops it down to a slower shutter speed. Am I missing something in the settings? ISO is set to 400 also. Chalky What lens do you use? If you use a lens with manual aperture setting, then you cannot use Tv and if you choose this setting it automatically reverts to Av. The result is that your shutter speed setting wiil be adjusted, because there is no aperture to adjust automtically. Last edited by AfterPentax Mark II; 09-05-2021 at 11:33 AM. Reason: additonal information added

09-05-2021, 12:52 PM - 1 Like	#3
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,198	Originally posted by Chalky66 When the image is not so bright, instead of under exposing at set speed of 400, it drops it down to a slower shutter speed. At the point it drops the shutter speed...what is the aperture set to ? I imagine it is widest aperture. If you have auto -exposure adjustment set in the camera, then it will use a slower shutter speed. If you want an underexposed image then turn it off. Last edited by pschlute; 09-05-2021 at 12:58 PM.

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09-05-2021, 01:42 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by pschlute If you have auto -exposure adjustment set in the camera, then it will use a slower shutter speed. Yep...meaning menu > C1 > Auto EV Compensation Steve

09-06-2021, 12:28 AM - 1 Like	#5
Chalky66 New Member Join Date: Oct 2020 Posts: 4 Original Poster	Originally posted by AfterPentax Mark II What lens do you use? If you use a lens with manual aperture setting, then you cannot use Tv and if you choose this setting it automatically reverts to Av. The result is that your shutter speed setting wiil be adjusted, because there is no aperture to adjust automtically. The lens is 55-300 ED PLM WR.( Nice lens,by the way.) Just turned off Auto ev and it does as it should. Thanks for the info. Mal

09-06-2021, 12:28 AM - 1 Like	#6
Chalky66 New Member Join Date: Oct 2020 Posts: 4 Original Poster	Originally posted by pschlute At the point it drops the shutter speed...what is the aperture set to ? I imagine it is widest aperture. If you have auto -exposure adjustment set in the camera, then it will use a slower shutter speed. If you want an underexposed image then turn it off. Many thanks . It worked. Mal

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