> So which option gives the least noise ?
> a. 16 minute exposure @ISO 100
> b. 1 minute exposure @ISO 1600
>
> What is the answer of an E-1 ?
> How about E-M5 ?
I am not an authority on the E-M5, but the E-1 I can answer.
With the E-1, you will be better off keeping the ISO low and extending
the exposure. Between ISO 100 and 400, the ISO is increased through a
bias increase, so the noise scales accordingly. However, 800 and 1600
are boost exposures, which means that all noise and everything is
boosted. It does get ugly in a hurry.
With ISO boosting, the noise gain is usually linear. But with time
extension, it is not as linear. There comes a point with the E-1 where
noise increase levels out and the increase is at a lower rate.
The E-1 is a most unusual camera because it allows you to shadow
recover without banding artifacts. You can shoot it underexposed and
recover the image during the raw conversion. The advantage is over
in-camera boost, is that the noise-control algorithm in Lightroom is
superior to what is in-camera.
While I've shot many pictures at ISO 800 and 1600 with the E-1, my
best images have been at ISO 400 and keeping the exposure below 30
seconds. My E-1s haven't liked going past 30 seconds.
--
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
--
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