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[EOS RP] how to properly disable safety shift for iso speed settings?

Started 4 weeks ago | Questions
chris_lng New Member • Posts: 1
[EOS RP] how to properly disable safety shift for iso speed settings?

Hello,

I'm trying to set a minimum shutter speed without it to be overriden when the camera detects that the exposure isn't high enough. I've heard about the safety shift in the custom exposure functions and it is set to Disable, but in Aperture Priority Mode, darker situations still goes below my minimum set shutter speed.

Do you guys know if I'm missing something?

Thanks in advance!

ANSWER:
This question has not been answered yet.
drsnoopy Senior Member • Posts: 1,216
Re: [EOS RP] how to properly disable safety shift for iso speed settings?

chris_lng wrote:

Hello,

I'm trying to set a minimum shutter speed without it to be overriden when the camera detects that the exposure isn't high enough. I've heard about the safety shift in the custom exposure functions and it is set to Disable, but in Aperture Priority Mode, darker situations still goes below my minimum set shutter speed.

Do you guys know if I'm missing something?

Thanks in advance!

Not an exact answer - but I would suggest the easiest way to deal with your issue is to use manual mode with auto ISO, and choose your own shutter speed and aperture. Then you can set a maximum ISO if you choose. In low light situations it’s generally better to have a sharp image even if there is some noise.

 drsnoopy's gear list:drsnoopy's gear list
Canon EOS RP Canon EOS R5 Canon EOS R10 Canon EF 100mm F2.8L Macro IS USM Canon RF 35mm F1.8 IS STM Macro +10 more
John Sheehy Forum Pro • Posts: 26,688
Re: [EOS RP] how to properly disable safety shift for iso speed settings?

drsnoopy wrote:

chris_lng wrote:

Hello,

I'm trying to set a minimum shutter speed without it to be overriden when the camera detects that the exposure isn't high enough. I've heard about the safety shift in the custom exposure functions and it is set to Disable, but in Aperture Priority Mode, darker situations still goes below my minimum set shutter speed.

Do you guys know if I'm missing something?

Thanks in advance!

Not an exact answer - but I would suggest the easiest way to deal with your issue is to use manual mode with auto ISO, and choose your own shutter speed and aperture. Then you can set a maximum ISO if you choose.

Setting a max ISO in M mode, of course, will never limit noise; it will just give you darker JPEG and review images and slightly more post-gain read noise due to a lower ISO setting than what would be "normal" for the manual exposure.

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Sittatunga Veteran Member • Posts: 5,406
Re: [EOS RP] how to properly disable safety shift for iso speed settings?
1

chris_lng wrote:

Hello,

I'm trying to set a minimum shutter speed without it to be overriden when the camera detects that the exposure isn't high enough. I've heard about the safety shift in the custom exposure functions and it is set to Disable, but in Aperture Priority Mode, darker situations still goes below my minimum set shutter speed.

Do you guys know if I'm missing something?

Thanks in advance!

Not an RP owner, but the minimum shutter speed that I set in the C.Fn2: Exposure menu is always respected in M, Av, Fv and Tv modes.  If I'm in Av mode, with Auto ISO the camera will set ISO 100 until the shutter speed drops to the faster of 1/(focal length) or my minimum shutter speed, then progressively raise the ISO as the light drops until it reaches the maximum allowable that I've set. After that, if my minimum shutter speed is greater than 1/(focal length) it will progressively underexpose, or the shutter speed will drop with the light level to my minimum and then it will underexpose.

drsnoopy Senior Member • Posts: 1,216
Re: [EOS RP] how to properly disable safety shift for iso speed settings?

John Sheehy wrote:

drsnoopy wrote:

chris_lng wrote:

Hello,

I'm trying to set a minimum shutter speed without it to be overriden when the camera detects that the exposure isn't high enough. I've heard about the safety shift in the custom exposure functions and it is set to Disable, but in Aperture Priority Mode, darker situations still goes below my minimum set shutter speed.

Do you guys know if I'm missing something?

Thanks in advance!

Not an exact answer - but I would suggest the easiest way to deal with your issue is to use manual mode with auto ISO, and choose your own shutter speed and aperture. Then you can set a maximum ISO if you choose.

Setting a max ISO in M mode, of course, will never limit noise; it will just give you darker JPEG and review images and slightly more post-gain read noise due to a lower ISO setting than what would be "normal" for the manual exposure.

Correct, of course, but you can make that ISO limit quite high, and if the aim is to have a sharp image due to an acceptably fast shutter speed (assuming handheld or subject movement), then noise and/or underexposure is the inevitable consequence. You have to compromise on one part of the exposure triangle. The OP specifically complained about an unacceptably slow shutter speed.

Do you have a different suggestion?

 drsnoopy's gear list:drsnoopy's gear list
Canon EOS RP Canon EOS R5 Canon EOS R10 Canon EF 100mm F2.8L Macro IS USM Canon RF 35mm F1.8 IS STM Macro +10 more
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