ISOless sensors, read noise and photography - many questions!

Started Oct 3, 2013 | Discussions thread
RussellInCincinnati Veteran Member • Posts: 3,201
examples already in this thread

WilbaW wrote: You've missed the point entirely. The question is not, can it be done?, the question is, can it be done without penalty?...To determine that for yourself you'd have to compare an ISO 4000 shot with an ISO 800 shot pushed to 4000 and matched to the appearance of the 4000 shot.

WilbaW, have been hesitating to think, that you believe us to be so dull as to write a bunch of posts in multiple threads on this topic, without having done this kind of comparison. Furthermore, posted weeks ago just the kind of comparison you mention already, in this thread. But by all means, let's do it again.

Lack of highlight detail makes it easy for me to remember this is with camera raw firmware set to ISO 3200.

Camera set to ISO 800, then brightness/ISO "pushed" in Lightroom 4.

Finally, in the some-shadow-detail-no-ordinary-person-ever-sees department.

Perhaps you can notice the tradeoff between increased shadow detail banding in the pushed-in-Lightroom low ISO (800) image on the left, and the decreased highlight detail in the pushed-in-camera-firmware high-ISO (3200) picture fragment on the right.

By the way there is no amount of highlight recovery or photo darkening that can bring back highlight detail in the above example taken-at-ISO-3200 image, it simply does not exist. Whereas when you "underexpose" an image by keeping the camera at say ISO 800 in the low light, you have the luxury of doing this kind of high dynamic range image if the mood strikes you:

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