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<blockquote data-quote="J-see" data-source="post: 404457" data-attributes="member: 31330">I'm not the type to do tutorials. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink&nbsp; &nbsp; ;)" loading="lazy" data-shortname=";)" /> I think it depends on the cam and the sensitivity of the sensor but for mine stars don't require high ISO. A different sensor might not do as well at ISO 100.When it clips might be another matter. I didn't find information yet how the cam defines brightness levels but that seems to be definitive in a RAW file. Once information is clipped, it is lost forever so something is making decisions which strength of signal will be neglected and stored as 0 and which fully saturates the pixel and is stored as 255 and ISO influences that decision. It's also a post-sensor process but apparently one I can't get around in post.ISO only influences how the photons are counted so I don't really understand why we can't change that afterwards. The cam knows the count and the method of counting. If the cam stores the values of every pixel, in theory, when shooting manual, you should be able to over or underexpose in post even if clipping occurs since ISO does not affect the incoming signal in manual mode. Maybe bit size is the limiter here, I don't know.</blockquote>

[QUOTE="J-see, post: 404457, member: 31330"] I'm not the type to do tutorials. ;) I think it depends on the cam and the sensitivity of the sensor but for mine stars don't require high ISO. A different sensor might not do as well at ISO 100. When it clips might be another matter. I didn't find information yet how the cam defines brightness levels but that seems to be definitive in a RAW file. Once information is clipped, it is lost forever so something is making decisions which strength of signal will be neglected and stored as 0 and which fully saturates the pixel and is stored as 255 and ISO influences that decision. It's also a post-sensor process but apparently one I can't get around in post. ISO only influences how the photons are counted so I don't really understand why we can't change that afterwards. The cam knows the count and the method of counting. If the cam stores the values of every pixel, in theory, when shooting manual, you should be able to over or underexpose in post even if clipping occurs since ISO does not affect the incoming signal in manual mode. Maybe bit size is the limiter here, I don't know. [/QUOTE]

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