High ISO vs sensor noise during long exposures.

Started May 16, 2012 | Discussions thread
highq_ee Regular Member • Posts: 116
Re: High ISO vs sensor noise during long exposures.


if you take equal exposure terms, then low-ISO/long-exposure will provide better IQ then equal higher-ISO/shorter-exposure.

for example: 20 seconds ISO100 will be less noisier than 5 seconds ISO400. Not a lot, but a little bit. today's modern CMOS can take very long exposures with very little noise.

then again, when you run out of exposure time, like for example star photography (if you don't want to have star trails but sharp dots), but you need maximum "okay" IQ, then you need to up the ISO.

also, if you need to activate dark frame substraction (don't remember what it's called, i guess "long exposuse NR" on pana gf1), then long exposures are pain take as you have to wait.

but hey, to make things even more confusing: there's a third option, that's actually may be the best to get maximum exposure in relative short time and it's called image stacking. take a lot of short/medium length exposures at relatively high ISO and stack/add them so that every exposure adds a bit to the final image. google "startrails photography image stacking" and you'll find a lot of guides.

the downside: you'll need the tools (like intervalometer and special software) and it takes some time to do it properly.

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