Ricoh GRIII / auto mini-ISO speed

PONCET · 02-05-2020, 01:22 PM

Bonjour

J’ai paramétré une vitesse minimum de 1/125e et je ne comprends pas pourquoi en ISO auto (6400 ISO) il arrive que la vitesse descend en-dessous de la vitesse minimum. Dans ce cas, à quoi sert le paramétrage? A moins qu’il y ait un autre réglage que je ne connais.
Merci de vos avis
Cordialement

Translation (added by moderator):

Hello

I have set a minimum speed of 1 / 125th and I do not understand why in auto ISO (ISO 6400) it happens that the speed drops below the minimum speed. In this case, what is the setting for? Unless there is another setting that I do not know.
Thank you for your opinions
cordially

Last edited by BigMackCam; 02-05-2020 at 02:58 PM. Reason: Tranlslated to English (forum posts must be in English)

Bertrand3000 · 02-05-2020, 02:38 PM

Hi there,

I don't know how the GRIII is exactly, but if the camera is trying to get the correct exposure, and cannot get it because it is a dark scene, and is already at max ISO and already widest aperture, then speed will need to be lowered.

Try the TV mode, set speed to 1/125. Then the camera will try to adjust ISO and aperture. On a DSLR, if it cannot get a correct exposure, numbers will blink in red and your shots will be underexposed.

aaacb · 02-05-2020, 06:15 PM

I'm assuming you're shooting in Av or P, with a min shutter set to 1/125 and max ISO of 6400, then the behavior you're seeing is normal. The camera will try to set an iso high enough to ensure that min shutter speed of 1/125. If it's too dark at the max iso limit, it will lengthen the shutter (what you're seeing). If it's too bright for the min ISO (such as ISO 100, or what you have set), it will increase shutter speed.

PONCET · 02-06-2020, 03:08 AM

Originally posted by aaacb

I'm assuming you're shooting in Av or P, with a min shutter set to 1/125 and max ISO of 6400, then the behavior you're seeing is normal. The camera will try to set an iso high enough to ensure that min shutter speed of 1/125. If it's too dark at the max iso limit, it will lengthen the shutter (what you're seeing). If it's too bright for the min ISO (such as ISO 100, or what you have set), it will increase shutter speed.

Bonjour

Merci pour ces conseils.
Si je comprends bien, en ISO AUTO, la limite supérieure maximum est 6400 ISO et la limite inférieure : 200 ISO.
Dans le menu, J'ai essayé de paramétrer la valeur ISO minimum à 100 ISO qui n'est pas prise en compte et reste à 200 ISO.
Pouvez vous me le confirmer ?
Merci

Cordialement

02-05-2020, 01:22 PM	#1
PONCET New Member Join Date: Jun 2019 Posts: 13	Ricoh GRIII / auto mini-ISO speed Bonjour J’ai paramétré une vitesse minimum de 1/125e et je ne comprends pas pourquoi en ISO auto (6400 ISO) il arrive que la vitesse descend en-dessous de la vitesse minimum. Dans ce cas, à quoi sert le paramétrage? A moins qu’il y ait un autre réglage que je ne connais. Merci de vos avis Cordialement Translation (added by moderator): Hello I have set a minimum speed of 1 / 125th and I do not understand why in auto ISO (ISO 6400) it happens that the speed drops below the minimum speed. In this case, what is the setting for? Unless there is another setting that I do not know. Thank you for your opinions cordially Last edited by BigMackCam; 02-05-2020 at 02:58 PM. Reason: Tranlslated to English (forum posts must be in English)

02-05-2020, 02:38 PM	#2
Bertrand3000 Veteran Member Join Date: Feb 2019 Posts: 2,009	Hi there, I don't know how the GRIII is exactly, but if the camera is trying to get the correct exposure, and cannot get it because it is a dark scene, and is already at max ISO and already widest aperture, then speed will need to be lowered. Try the TV mode, set speed to 1/125. Then the camera will try to adjust ISO and aperture. On a DSLR, if it cannot get a correct exposure, numbers will blink in red and your shots will be underexposed. Last edited by Bertrand3000; 02-05-2020 at 02:44 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Used Like New Ricoh GRIII at Amazon for $672	Mr Bassie	Pentax Price Watch	2	09-28-2019 06:41 AM
RICOH GRIII Officially Announced	OoKU	Pentax News and Rumors	329	07-23-2019 08:38 AM
New Ricoh GRiii front “ring” loose	Nonpedestrian	Repairs and Warranty Service	14	07-10-2019 11:03 PM
Ricoh GRIII on pre-order in The Netherlands	RonHendriks1966	Pentax News and Rumors	5	02-21-2019 09:42 AM
Architecture La Grand Vitesse	Scorpio71GR	Post Your Photos!	2	04-18-2017 01:46 AM

02-05-2020, 06:15 PM	#3
aaacb Pentaxian Join Date: May 2016 Photos: Gallery Posts: 3,725	I'm assuming you're shooting in Av or P, with a min shutter set to 1/125 and max ISO of 6400, then the behavior you're seeing is normal. The camera will try to set an iso high enough to ensure that min shutter speed of 1/125. If it's too dark at the max iso limit, it will lengthen the shutter (what you're seeing). If it's too bright for the min ISO (such as ISO 100, or what you have set), it will increase shutter speed.

02-06-2020, 03:08 AM	#4
PONCET New Member Join Date: Jun 2019 Posts: 13 Original Poster	Originally posted by aaacb I'm assuming you're shooting in Av or P, with a min shutter set to 1/125 and max ISO of 6400, then the behavior you're seeing is normal. The camera will try to set an iso high enough to ensure that min shutter speed of 1/125. If it's too dark at the max iso limit, it will lengthen the shutter (what you're seeing). If it's too bright for the min ISO (such as ISO 100, or what you have set), it will increase shutter speed. Bonjour Merci pour ces conseils. Si je comprends bien, en ISO AUTO, la limite supérieure maximum est 6400 ISO et la limite inférieure : 200 ISO. Dans le menu, J'ai essayé de paramétrer la valeur ISO minimum à 100 ISO qui n'est pas prise en compte et reste à 200 ISO. Pouvez vous me le confirmer ? Merci Cordialement