Canon EOS-1D X Mark II To Be 22mp [CR3]

[3kramd5]

...the current 1DX suits me just perfectly for my uses and I don't need a faster shutter or higher ISO's considering the price the 1DXII will be released at.

Probably the same for me. One stop of ISO improvement, 1-2 fps and 4 MP aren't enough of an improvement for me. A two stop ISO improvement would get me considering – a real two stops based on noise comparisons, not changes in the specs for native range or extra expansion (the latter is useless to me anyway).

Does anyone ever buy a rig based on a manufacturer's published ISO limits?

Does Canon or Nikon even publish how they set those limits, like 'highest ISO values determined by acheiving X SNR with shots taken in Y conditions'? I'm not aware of that happening, so I generally completely disregard ISO claims / max allowable levels and just wait for proper test shots compared against what I currently shoot.

- A

No, they don't have to because the values are based on an international standard: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=37777

 

[Loswr]

...the current 1DX suits me just perfectly for my uses and I don't need a faster shutter or higher ISO's considering the price the 1DXII will be released at.

Probably the same for me. One stop of ISO improvement, 1-2 fps and 4 MP aren't enough of an improvement for me. A two stop ISO improvement would get me considering – a real two stops based on noise comparisons, not changes in the specs for native range or extra expansion (the latter is useless to me anyway).

Does anyone ever buy a rig based on a manufacturer's published ISO limits?

Does Canon or Nikon even publish how they set those limits, like 'highest ISO values determined by acheiving X SNR with shots taken in Y conditions'? I'm not aware of that happening, so I generally completely disregard ISO claims / max allowable levels and just wait for proper test shots compared against what I currently shoot.

- A

No, they don't have to because the values are based on an international standard: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=37777

Does the ISO standard specify noise (which was the point ahsanford was making), or only exposure?

 

[3kramd5]

...the current 1DX suits me just perfectly for my uses and I don't need a faster shutter or higher ISO's considering the price the 1DXII will be released at.

Probably the same for me. One stop of ISO improvement, 1-2 fps and 4 MP aren't enough of an improvement for me. A two stop ISO improvement would get me considering – a real two stops based on noise comparisons, not changes in the specs for native range or extra expansion (the latter is useless to me anyway).

Does anyone ever buy a rig based on a manufacturer's published ISO limits?

Does Canon or Nikon even publish how they set those limits, like 'highest ISO values determined by acheiving X SNR with shots taken in Y conditions'? I'm not aware of that happening, so I generally completely disregard ISO claims / max allowable levels and just wait for proper test shots compared against what I currently shoot.

- A

No, they don't have to because the values are based on an international standard: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=37777

Does the ISO standard specify noise (which was the point ahsanford was making), or only exposure?

It does, but it's a fair point because manufacturers more likely use saturation than SNR in their ratings.

 

[Loswr]

...the current 1DX suits me just perfectly for my uses and I don't need a faster shutter or higher ISO's considering the price the 1DXII will be released at.

Probably the same for me. One stop of ISO improvement, 1-2 fps and 4 MP aren't enough of an improvement for me. A two stop ISO improvement would get me considering – a real two stops based on noise comparisons, not changes in the specs for native range or extra expansion (the latter is useless to me anyway).

Does anyone ever buy a rig based on a manufacturer's published ISO limits?

Does Canon or Nikon even publish how they set those limits, like 'highest ISO values determined by acheiving X SNR with shots taken in Y conditions'? I'm not aware of that happening, so I generally completely disregard ISO claims / max allowable levels and just wait for proper test shots compared against what I currently shoot.

- A

No, they don't have to because the values are based on an international standard: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=37777

Does the ISO standard specify noise (which was the point ahsanford was making), or only exposure?

It does, but it's a fair point because manufacturers more likely use saturation than SNR in their ratings.

To be more clear, does the ISO standard specify a limit on that noise? It was my understanding that the standard specifies the method by which an ISO exposure value shall be determined (several methods, actually, although not all are always applicable). AFAIK, it does not specify an 'acceptable' level of noise or SNR that determines the maximum amount of gain a manufacturer can apply, it only specifies how the gain should be related to output brightness for consistency. Also, as I understand it the most relevant of the methods, the only one that applies to the evaluative/matrix metering that is default on most cameras, relies upon a gain/exposure relationship that is arbitrarily determined by the manufacturer.

 

[3kramd5]

...the current 1DX suits me just perfectly for my uses and I don't need a faster shutter or higher ISO's considering the price the 1DXII will be released at.

Probably the same for me. One stop of ISO improvement, 1-2 fps and 4 MP aren't enough of an improvement for me. A two stop ISO improvement would get me considering – a real two stops based on noise comparisons, not changes in the specs for native range or extra expansion (the latter is useless to me anyway).

Does anyone ever buy a rig based on a manufacturer's published ISO limits?

Does Canon or Nikon even publish how they set those limits, like 'highest ISO values determined by acheiving X SNR with shots taken in Y conditions'? I'm not aware of that happening, so I generally completely disregard ISO claims / max allowable levels and just wait for proper test shots compared against what I currently shoot.

- A

No, they don't have to because the values are based on an international standard: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=37777

Does the ISO standard specify noise (which was the point ahsanford was making), or only exposure?

It does, but it's a fair point because manufacturers more likely use saturation than SNR in their ratings.

To be more clear, does the ISO standard specify a limit on that noise? It was my understanding that the standard specifies the method by which an ISO exposure value shall be determined (several methods, actually, although not all are always applicable). AFAIK, it does not specify an 'acceptable' level of noise or SNR that determines the maximum amount of gain a manufacturer can apply, it only specifies how the gain should be related to output brightness for consistency. Also, as I understand it the most relevant of the methods, the only one that applies to the evaluative/matrix metering that is default on most cameras, relies upon a gain/exposure relationship that is arbitrarily determined by the manufacturer.

It defines acceptable and excellent signal to noise ratios (10 and 40, respectively).

 

[Loswr]

It defines acceptable and excellent signal to noise ratios (10 and 40, respectively).

Does that mean that the Nikon D5 must deliver at least an acceptable SNR of 10 at ISO 3,280,000?

 

[3kramd5]

It defines acceptable and excellent signal to noise ratios (10 and 40, respectively).

Does that mean that the Nikon D5 must deliver at least an acceptable SNR of 10 at ISO 3,280,000?

Doubtful. I believe that if it can't match that particular criteria, then the saturation method is used, or they use saturation by default (hence the "fair point" comment above).

 

[Loswr]

It defines acceptable and excellent signal to noise ratios (10 and 40, respectively).

Does that mean that the Nikon D5 must deliver at least an acceptable SNR of 10 at ISO 3,280,000?

Doubtful. I believe that if it can't match that particular criteria, then the saturation method is used, or they use saturation by default (hence the "fair point" comment above).

Except that based on the standard, the saturation method uses sRGB output from the camera, so it does not apply to RAW. Also, that method is not applicable when matrix metering is used (which is the default for the camera).

How, then, can Nikon include ISO 3,280,000 and be in compliance with ISO 12232? Does the camera firmware restrict it to TIFF output and a non-matrix metering mode at that ISO? Somehow, I doubt that.