FP ISO 64000

Started 3 months ago | Discussions thread
D Cox Forum Pro • Posts: 29,607
Re: FP ISO 64000

Johan Borg wrote:

D Cox wrote:

xpatUSA wrote:

Johan Borg wrote:

Roger wrote:

Hi gang how are you doing?? Well I hope. Here's the FP at ISO 64000

https://www.flickr.com/photos/157326682@N04/51122147663/in/album-72157719572189961/

Nice demonstration, although a dp2 Quattro would look better in the same light at f/2.8, 1/60 sec and ISO 400

The fp high ISO is amazing, 102,400 is quite usable in monochrome, although the in-camera JPEGs get a bit soft at that point.

This is not intended as a rebuttal, Johan.

I just don't understand the apparent fetish for seriously under-exposing a sensor and getting away with it.

Acceptable results in available light are a big step forward. I've lost so many shots because there wasn't enough light. You press the button anyway, hoping to get something, and the result is vanishingly thin negatives or hopelessly dark digital images, even at dangerously slow shutter speeds.

Yet I have to agree with Ted that there's a limit to the benefit, which is why I shared the alternative exposure settings above.

I have zillions of negs on Tri-X shot at settings like that. The shutter speed is too slow for people who are a few feet away, and the DoF isn't enough to capture two people in focus.  Sometimes you get lucky, but a few stops would make all the difference.

May I ask what the "native ISO" is for an fp, assuming the SOS method?

There are two "base ISO" numbers, depending on which of the analog amp gains is in use.

Yes, but it's a bit of a trick question from Ted because he doesn't accept Sigma's method of defining ISO (REI) for an answer.

For the rest of us, the answer is dual base ISO of 100 and 640 as well as 3200 for CinemaDNG in 12 bit.

Don

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