Roger.Sarrazin
New member
Does anyone know what the ISO settings below 100 actually are? Lo0.3, Lo 0.7 and Lo 1.0
D7500 ISO
- Thread starter Roger.Sarrazin
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They would be 80, 64, and 50 - but don't use them.
Basically, they are "fake" values. If you dial them in, the camera will just overexpose by an amount that would equal that ISO. Then, the camera tires to pull the expsoure down to give you a "correct" expsoure. The problem is, if it blew the highlights by overexposing, you can't get them back.
Another way to think about it is if you were to overexpose a RAW image by a stop and then try to bring it down with Lightroom. Sometimes it works, sometimes it doesn't, but the bottom line with the Lo settings is that you're actually not gaining anything, the camera is just overexposing and trying to fix the overexposure with varying degrees of success.
Basically, they are "fake" values. If you dial them in, the camera will just overexpose by an amount that would equal that ISO. Then, the camera tires to pull the expsoure down to give you a "correct" expsoure. The problem is, if it blew the highlights by overexposing, you can't get them back.
Another way to think about it is if you were to overexpose a RAW image by a stop and then try to bring it down with Lightroom. Sometimes it works, sometimes it doesn't, but the bottom line with the Lo settings is that you're actually not gaining anything, the camera is just overexposing and trying to fix the overexposure with varying degrees of success.
Roger.Sarrazin
New member
Thanks Steve - I suspected as much or Nikon would have called one of them the base ISO.
BTW your guides have taken my photography to the next level! So many more well exposed and properly focused keepers. Long live BB focus and Exposure lock on Fn button!!
Thanks for sharing your knowledge we all greatly appreciate it.
BTW your guides have taken my photography to the next level! So many more well exposed and properly focused keepers. Long live BB focus and Exposure lock on Fn button!!
Thanks for sharing your knowledge we all greatly appreciate it.