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<blockquote data-quote="J-see" data-source="post: 404333" data-attributes="member: 31330">I tested the information I read about ISO being a post-sensor process. It implies that no matter what the ISO setting, the sensor does not count more or less photons. That means that unless there is clipping, I should be able to grab as many stars using ISO 100 as I do at ISO 6400. All that ISO does is increase noise and saturated pixels.I shot the 100 through 6400 range at 20 min and then processed those solely to check the differences in the sky. The higher the ISO, the more issues I had with the present pollution.Here's the series:[ATTACH]133957[/ATTACH][ATTACH]133958[/ATTACH][ATTACH]133959[/ATTACH][ATTACH]133960[/ATTACH][ATTACH]133961[/ATTACH][ATTACH]133962[/ATTACH][ATTACH]133963[/ATTACH]Even when some stars are brighter at higher ISO, that as easily can be accomplished by blending the same shot. All that ISO seems to add (for my cam) is noise and haze.The best for my cam is to open up as wide as possible and shoot the longest shutter possible at ISO 100. The rest is best done in post since there the noise is not multiplied.</blockquote>

[QUOTE="J-see, post: 404333, member: 31330"] I tested the information I read about ISO being a post-sensor process. It implies that no matter what the ISO setting, the sensor does not count more or less photons. That means that unless there is clipping, I should be able to grab as many stars using ISO 100 as I do at ISO 6400. All that ISO does is increase noise and saturated pixels. I shot the 100 through 6400 range at 20 min and then processed those solely to check the differences in the sky. The higher the ISO, the more issues I had with the present pollution. Here's the series: [ATTACH=CONFIG]133957._xfImport[/ATTACH] [ATTACH=CONFIG]133958._xfImport[/ATTACH] [ATTACH=CONFIG]133959._xfImport[/ATTACH] [ATTACH=CONFIG]133960._xfImport[/ATTACH] [ATTACH=CONFIG]133961._xfImport[/ATTACH] [ATTACH=CONFIG]133962._xfImport[/ATTACH] [ATTACH=CONFIG]133963._xfImport[/ATTACH] Even when some stars are brighter at higher ISO, that as easily can be accomplished by blending the same shot. All that ISO seems to add (for my cam) is noise and haze. The best for my cam is to open up as wide as possible and shoot the longest shutter possible at ISO 100. The rest is best done in post since there the noise is not multiplied. [/QUOTE]

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