why auto iso usually isn't below 160? A7c

[amit190]

Hi ,

I use standard settings with the a7c , I see that the minimum iso is 160 many times ,even if I open the aparture a stop or 2 for the same scene...

thanks

 

[kreygscott]

Hi ,

I use standard settings with the a7c , I see that the minimum iso is 160 many times ,even if I open the aparture a stop or 2 for the same scene...

thanks

MENU 1 - (CAMERA SETTINGS 1) - [ISO SETTINGS] -[ISO AUTO Min SS] - Desired Setting.

Hope this helps

 

[amit190]

hi ,it is set to standard -what should it be?

I tried fast and slower also 1/8000 and 30" .

still, minimum auto iso will be 160 even when overexposed...

 

[TomV1]

hi ,it is set to standard -what should it be?

I tried fast and slower also 1/8000 and 30" .

still, minimum auto iso will be 160 even when overexposed...

From the Sony On-line Manual for the a7C:

ISO Setting: ISO Range Limit

You can limit the range of ISO sensitivity when the ISO sensitivity is set manually.

1. MENU →
   
   
   
   (Camera Settings1) → [ISO Setting] → [ISO Range Limit] → [Minimum] or [Maximum], and select the desired values.

To set the range for [ISO AUTO]

If you want to adjust the range of ISO sensitivity that is automatically set in the [ISO AUTO] mode, select MENU →

(Camera Settings1) → [ISO Setting] → [ISO] → [ISO AUTO], and then press the right side of the control wheel to select [ISO AUTO Maximum]/[ISO AUTO Minimum].

Note

• ISO sensitivity values beyond the specified range become unavailable. To select ISO sensitivity values beyond the specified range, reset [ISO Range Limit].
• The available range for ISO sensitivity varies depending on the setting for [Gamma] under [Picture Profile].

 

[amit190]

hi ,it is set to standard -what should it be?

I tried fast and slower also 1/8000 and 30" .

still, minimum auto iso will be 160 even when overexposed...

From the Sony On-line Manual for the a7C:

ISO Setting: ISO Range Limit

You can limit the range of ISO sensitivity when the ISO sensitivity is set manually.

1. MENU →
   
   
   
   (Camera Settings1) → [ISO Setting] → [ISO Range Limit] → [Minimum] or [Maximum], and select the desired values.

To set the range for [ISO AUTO]

If you want to adjust the range of ISO sensitivity that is automatically set in the [ISO AUTO] mode, select MENU →

(Camera Settings1) → [ISO Setting] → [ISO] → [ISO AUTO], and then press the right side of the control wheel to select [ISO AUTO Maximum]/[ISO AUTO Minimum].

Note

• ISO sensitivity values beyond the specified range become unavailable. To select ISO sensitivity values beyond the specified range, reset [ISO Range Limit].
• The available range for ISO sensitivity varies depending on the setting for [Gamma] under [Picture Profile].

I use the original settings and no picture profile, so Iso 100 is in the range but somehow is blocked. the only way for me to get 100 iso is to select it exclusivly.

 

[TomV1]

hi ,it is set to standard -what should it be?

I tried fast and slower also 1/8000 and 30" .

still, minimum auto iso will be 160 even when overexposed...

From the Sony On-line Manual for the a7C:

ISO Setting: ISO Range Limit

You can limit the range of ISO sensitivity when the ISO sensitivity is set manually.

1. MENU →
   
   
   
   (Camera Settings1) → [ISO Setting] → [ISO Range Limit] → [Minimum] or [Maximum], and select the desired values.

To set the range for [ISO AUTO]

If you want to adjust the range of ISO sensitivity that is automatically set in the [ISO AUTO] mode, select MENU →

(Camera Settings1) → [ISO Setting] → [ISO] → [ISO AUTO], and then press the right side of the control wheel to select [ISO AUTO Maximum]/[ISO AUTO Minimum].

Note

• ISO sensitivity values beyond the specified range become unavailable. To select ISO sensitivity values beyond the specified range, reset [ISO Range Limit].
• The available range for ISO sensitivity varies depending on the setting for [Gamma] under [Picture Profile].

I use the original settings and no picture profile, so Iso 100 is in the range but somehow is blocked. the only way for me to get 100 iso is to select it exclusivly.

What do you mean by "I use the original settings"?

What are the parameter values for the 2 suggested settings above (min and max) for ISO Range Limit and ISO Auto?

 

[amit190]

hi ,it is set to standard -what should it be?

I tried fast and slower also 1/8000 and 30" .

still, minimum auto iso will be 160 even when overexposed...

From the Sony On-line Manual for the a7C:

ISO Setting: ISO Range Limit

You can limit the range of ISO sensitivity when the ISO sensitivity is set manually.

1. MENU →
   
   
   
   (Camera Settings1) → [ISO Setting] → [ISO Range Limit] → [Minimum] or [Maximum], and select the desired values.

To set the range for [ISO AUTO]

If you want to adjust the range of ISO sensitivity that is automatically set in the [ISO AUTO] mode, select MENU →

(Camera Settings1) → [ISO Setting] → [ISO] → [ISO AUTO], and then press the right side of the control wheel to select [ISO AUTO Maximum]/[ISO AUTO Minimum].

Note

• ISO sensitivity values beyond the specified range become unavailable. To select ISO sensitivity values beyond the specified range, reset [ISO Range Limit].
• The available range for ISO sensitivity varies depending on the setting for [Gamma] under [Picture Profile].

I use the original settings and no picture profile, so Iso 100 is in the range but somehow is blocked. the only way for me to get 100 iso is to select it exclusivly.

What do you mean by "I use the original settings"?

What are the parameter values for the 2 suggested settings above (min and max) for ISO Range Limit and ISO Auto?

iso auto

iso range limit 50-204800

iso auto min.ss standard

 

[TimMunsey]

Do you have it in Cinetone profile? This put my A9 111 at 320 minimum rather than iso 250.

 

[amit190]

Do you have it in Cinetone profile? This put my A9 111 at 320 minimum rather than iso 250.

no. I dont use picture profile...

 

[TomV1]

What lens focal length and shutter speeds are you using?

 

[amit190]

What lens focal length and shutter speeds are you using?

25mm .

shutter can be anything from 1/4000 to more then a second.

 

[amit190]

see link :

 

[chrisfisheye]

see link :

Set ISO 100 as the minimum ISO dor the range limit.

There is something strange with extended low ISO like ISO 50. It is an extended low ISO which uses ISO160 internally, which is a nonsense. It is a very very bad implementation of low ISO.

So the culprit is the use of ISO50, avoid it. It will accept more exposure with more risks of blowing highlights. This does not shock me because this is the purpose of using extended low ISO. The problem is that it uses ISO160 for that, if you use a program like rawdigger, it will proove this, there has been threads about this.

Again, use ISO100 for the minimum, problem fixed. I doubt the original settings were ISO50.

 

[amit190]

solved !!!!!

there is another iso limiter in the video mode (on wheel) , this iso lkmiter overrides the auto iso settings in all other modes ...

 

[chrisfisheye]

solved !!!!!

there is another iso limiter in the video mode (on wheel) , this iso lkmiter overrides the auto iso settings in all other modes ...

It was important that you solve this problem because you were loosing significant dynamic range with these settings... very high risk to blow highlights.

 

[TomV1]

solved !!!!!

there is another iso limiter in the video mode (on wheel) , this iso lkmiter overrides the auto iso settings in all other modes ...

Per the manual I get that going back to Photo from video should revert back:

• When shooting movies, ISO values between 100 and 102400 are available. If the ISO value is set to a value smaller than 100, the setting is automatically switched to 100. When you finish recording the movie, the ISO value returns to the original setting.

I am not saying what you are experiencing is incorrect since I do not have your camera, just parroting the manual.

Good find on your part.