GR III Question: Enforcing Minimum Shutter Speed in Auto ISO

marks1300 · 10-14-2020, 03:27 PM

Guys/Gals

OK I give up. Can't make this work no matter what user settings I use.

Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic.

Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60.

If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis.

Tried turning off the IBIS and didn't help.

Any ideas? I am stumped.

Thanks

Mark

**clackers** · 10-14-2020, 03:45 PM - **2 Likes**

Originally posted by marks1300

Guys/Gals

OK I give up. Can't make this work no matter what user settings I use.

Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic.

Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60.

If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis.

Tried turning off the IBIS and didn't help.

Any ideas? I am stumped.

Thanks

Mark

I don't have one, Mark, but the obvious question is, 'You're a photographer, why not flick to M mode and get the exposure you want?'.

stevebrot · 10-14-2020, 04:48 PM

Originally posted by marks1300

Any ideas? I am stumped.

I don't have a GR III at hand, but I can ask a few questions that may help forum members craft a suitable solution...

What exposure mode are you using, P or Tv?
Related to the above, how are you setting the shutter to 1/60s?
Do you have exposure compensation set, either manually or with auto-EC?
Are you familiar with using "ISO Setting --> Minimum Shutter Speed" to influence auto-ISO behavior?

With any luck, a good solution will present itself.

Steve

gbl · 10-14-2020, 05:21 PM

Are you in Shutter priority (Tv)?

Originally posted by marks1300

Guys/Gals

OK I give up. Can't make this work no matter what user settings I use.

Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic.

Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60.

If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis.

Tried turning off the IBIS and didn't help.

Any ideas? I am stumped.

Thanks

Mark

sdejongh · 10-14-2020, 10:57 PM - **1 Like**

My GRIII works just fine with Auto ISO and minimum Shutter speed.

Btw you need to use "Av" mode.
I only set the Min iso (100), max ISO (12800) and min shutter speed (1/60s) in the ISO sensivity setting (Shooting menu, 2nd page).

Btw if there's not enough light and the Max ISO you set is not enough, the device will continue to lower the shutter speed to compensate.

cport · 10-14-2020, 11:05 PM

Originally posted by marks1300

Guys/Gals

OK I give up. Can't make this work no matter what user settings I use.

Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic.

Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60.

If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis.

Tried turning off the IBIS and didn't help.

Any ideas? I am stumped.

Thanks

Mark

This depends in which mode (Tv, Av, etc.) you are ...

In Av - once max ISO is reached, the min shutter speed can be even lowered and the exposure can be preserved ...

In Tv - once max ISO is reached, the min shutter speed is preserved and the exposure can be "underexposed" ...

In M ... it is completely up to you ;-)

It all depends on your setting and needs ;-)

marks1300 · 10-15-2020, 03:49 PM

I was hoping I could stay in auto ISO in Av mode, set my aperture, have the SS enforced, and then use the underexposure as a metric to adjust my ISO up if necessary.

It would seem I will have to give up on this, and use the Tv or manual modes if I really want to enforce the SS.

Thanks everybody for your help.

Mark

**clackers** · 10-15-2020, 08:55 PM

Originally posted by marks1300

I was hoping I could stay in auto ISO in Av mode, set my aperture, have the SS enforced, and then use the underexposure as a metric to adjust my ISO up if necessary.

It would seem I will have to give up on this, and use the Tv or manual modes if I really want to enforce the SS.

Thanks everybody for your help.

Mark

I think you're far better off doing that, Mark - shooting Manual - instead of using modes that have their own algorithms.

stevebrot · 10-15-2020, 10:14 PM - **1 Like**

Originally posted by clackers

I think you're far better off doing that, Mark - shooting Manual - instead of using modes that have their own algorithms.

I agree, with the additional note that using a fixed ISO in M mode is probably preferable to figuring out the quirks of what role auto-ISO plays in that mode.

Steve

**clackers** · 10-15-2020, 10:26 PM

Originally posted by stevebrot

I agree, with the additional note that using a fixed ISO in M mode is probably preferable to figuring out the quirks of what role auto-ISO plays in that mode.

Steve

Sure, and once flash comes into it ... it's simply not worth letting the camera decide the ISO for that.

gbl · 10-16-2020, 08:32 AM

I'm a bit puzzled to the Original poster's claim that his Fuji and Nikon cameras do what he wants. Because they don't. They react just like the Ricoh. If one uses Aperture priority with a Fuji and minimum shutter speed and max ISO, the camera will use the ISO as a true maximum, but will override the minimum shutter speed if needed to get the right exposure.
In connection with ISO, the minimum shutter speed is only used in to tell the camera when to switch to the next higher ISO value. It will never underexpose. But that's the case with every camera I have used so far.

So I'm still not sure what the problem really is. The only way a camera reacts the way he describes in his first post is in full manual or Shutter priority.

**AgentL** · 10-16-2020, 09:30 AM - **1 Like**

What's going on is that you're trying to set the minimum shutter speed for auto-ISO, which only means the camera won't select a lower shutter UNTIL your top ISO limit is reached and exposure can't be obtained at the level that the camera has been told to aim for. Thus, shutter drops. You want M mode, with auto-ISO on, or S mode, same. By the way, ISO 1600 is way too low for shooting in a dark room with a good sensor like the GR III. You can go to 6400 without really pushing quality, 12800 is also quite usable but grainy.

Remember that you can shoot in M with auto-ISO and still bias your EV setting, also, if you're using 1/60 then that tells me you're not worried about subject motion, but rather hand shake - remember you've got very useful IBIS in this camera. You can go lower.

10-14-2020, 03:27 PM	#1
marks1300 New Member Join Date: Oct 2020 Posts: 2	GR III Question: Enforcing Minimum Shutter Speed in Auto ISO Guys/Gals OK I give up. Can't make this work no matter what user settings I use. Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic. Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60. If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis. Tried turning off the IBIS and didn't help. Any ideas? I am stumped. Thanks Mark

10-14-2020, 04:48 PM	#3
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by marks1300 Any ideas? I am stumped. I don't have a GR III at hand, but I can ask a few questions that may help forum members craft a suitable solution... What exposure mode are you using, P or Tv? Related to the above, how are you setting the shutter to 1/60s? Do you have exposure compensation set, either manually or with auto-EC? Are you familiar with using "ISO Setting --> Minimum Shutter Speed" to influence auto-ISO behavior? With any luck, a good solution will present itself. Steve

10-16-2020, 08:32 AM	#11
gbl Senior Member Join Date: Oct 2018 Location: NRW, Germany Posts: 128	I'm a bit puzzled to the Original poster's claim that his Fuji and Nikon cameras do what he wants. Because they don't. They react just like the Ricoh. If one uses Aperture priority with a Fuji and minimum shutter speed and max ISO, the camera will use the ISO as a true maximum, but will override the minimum shutter speed if needed to get the right exposure. In connection with ISO, the minimum shutter speed is only used in to tell the camera when to switch to the next higher ISO value. It will never underexpose. But that's the case with every camera I have used so far. So I'm still not sure what the problem really is. The only way a camera reacts the way he describes in his first post is in full manual or Shutter priority. Last edited by gbl; 10-16-2020 at 08:37 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
RICOH GRIII - Program shift Auto-ISO does not respect minimum shutter speed	ne!	Ricoh GR	5	07-30-2020 09:52 PM
Lifespan of ricoh gr / gr II / gr III - how long do/did you have your ricoh?	lunarwitch	Ricoh GR	11	11-20-2019 12:36 PM
new user- cif & minimum shutter speed with manual lens	zzzxtreme	Pentax K-5 & K-5 II	5	05-30-2019 08:44 PM
Flash Auto-ISO Auto Shutter Speed	Lobalobo	Pentax Q	4	01-19-2016 08:40 PM
Aperture + minimum speed -> iso ??	FixB	Pentax DSLR Discussion	6	04-18-2011 06:58 AM

10-14-2020, 03:45 PM - 2 Likes	#2
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by marks1300 Guys/Gals OK I give up. Can't make this work no matter what user settings I use. Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic. Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60. If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis. Tried turning off the IBIS and didn't help. Any ideas? I am stumped. Thanks Mark I don't have one, Mark, but the obvious question is, 'You're a photographer, why not flick to M mode and get the exposure you want?'.

10-14-2020, 05:21 PM	#4
gbl Senior Member Join Date: Oct 2018 Location: NRW, Germany Posts: 128	Are you in Shutter priority (Tv)? Originally posted by marks1300 Guys/Gals OK I give up. Can't make this work no matter what user settings I use. Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic. Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60. If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis. Tried turning off the IBIS and didn't help. Any ideas? I am stumped. Thanks Mark

10-14-2020, 10:57 PM - 1 Like	#5
sdejongh New Member Join Date: Oct 2020 Location: Brussels Posts: 2	My GRIII works just fine with Auto ISO and minimum Shutter speed. Btw you need to use "Av" mode. I only set the Min iso (100), max ISO (12800) and min shutter speed (1/60s) in the ISO sensivity setting (Shooting menu, 2nd page). Btw if there's not enough light and the Max ISO you set is not enough, the device will continue to lower the shutter speed to compensate.

10-14-2020, 11:05 PM	#6
cport Pentaxian Join Date: Jan 2013 Posts: 428	Originally posted by marks1300 Guys/Gals OK I give up. Can't make this work no matter what user settings I use. Trying to set 1/60 SS, Min ISO 100, Max ISO 1600. Pretty basic. Try to take a picture in a dark room and the shutter speed goes down and down, below 1/60. If the max ISO is too low to support the SS and aperture the camera should enforce the SS and underexpose. Like my Nikons and my Fujis. Tried turning off the IBIS and didn't help. Any ideas? I am stumped. Thanks Mark This depends in which mode (Tv, Av, etc.) you are ... In Av - once max ISO is reached, the min shutter speed can be even lowered and the exposure can be preserved ... In Tv - once max ISO is reached, the min shutter speed is preserved and the exposure can be "underexposed" ... In M ... it is completely up to you ;-) It all depends on your setting and needs ;-)

10-15-2020, 03:49 PM	#7
marks1300 New Member Join Date: Oct 2020 Posts: 2 Original Poster	I was hoping I could stay in auto ISO in Av mode, set my aperture, have the SS enforced, and then use the underexposure as a metric to adjust my ISO up if necessary. It would seem I will have to give up on this, and use the Tv or manual modes if I really want to enforce the SS. Thanks everybody for your help. Mark

10-15-2020, 08:55 PM	#8
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by marks1300 I was hoping I could stay in auto ISO in Av mode, set my aperture, have the SS enforced, and then use the underexposure as a metric to adjust my ISO up if necessary. It would seem I will have to give up on this, and use the Tv or manual modes if I really want to enforce the SS. Thanks everybody for your help. Mark I think you're far better off doing that, Mark - shooting Manual - instead of using modes that have their own algorithms.

10-15-2020, 10:14 PM - 1 Like	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by clackers I think you're far better off doing that, Mark - shooting Manual - instead of using modes that have their own algorithms. I agree, with the additional note that using a fixed ISO in M mode is probably preferable to figuring out the quirks of what role auto-ISO plays in that mode. Steve

10-15-2020, 10:26 PM	#10
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by stevebrot I agree, with the additional note that using a fixed ISO in M mode is probably preferable to figuring out the quirks of what role auto-ISO plays in that mode. Steve Sure, and once flash comes into it ... it's simply not worth letting the camera decide the ISO for that.

10-16-2020, 09:30 AM - 1 Like	#12
AgentL Site Supporter Join Date: Sep 2020 Location: Seattle Photos: Albums Posts: 1,756	What's going on is that you're trying to set the minimum shutter speed for auto-ISO, which only means the camera won't select a lower shutter UNTIL your top ISO limit is reached and exposure can't be obtained at the level that the camera has been told to aim for. Thus, shutter drops. You want M mode, with auto-ISO on, or S mode, same. By the way, ISO 1600 is way too low for shooting in a dark room with a good sensor like the GR III. You can go to 6400 without really pushing quality, 12800 is also quite usable but grainy. Remember that you can shoot in M with auto-ISO and still bias your EV setting, also, if you're using 1/60 then that tells me you're not worried about subject motion, but rather hand shake - remember you've got very useful IBIS in this camera. You can go lower.