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Usefulness of AutoGain feature on Multiple Exposure??

elec164

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"RE: Usefulness of AutoGain feature on Multiple Exposure??"

elec164 Silver Member Nikonian since 15th Jan 2009
Thu 17-Jan-13 04:59 PM

>-- and I think this is what Brian is driving at -- is whether
>the SNR will be reduced more by taking three high-ISO shots
>and merging them compared to taking one low-ISO shot, albeit
>at a longer exposure.

I think it depends on what the Gain in “AutoGain” means.

You are taking it to mean ISO or A/D amplification where it could mean a setting in post capture processing.

For example I shot these test images at base ISO of 100 (the D7000 has no Lo ISO settings).

This is single capture.

Click on image to view larger version


This is a three shot multiple exposure with AutoGain enabled.

Click on image to view larger version



They are NEF's using LR3 for conversion, using the Auto button (there was an apparent difference in exposure between the two) and a 71 sharpening setting only. Then I handed off to PS for cropping to 100% and saving.

To me there is significant difference in the darker background.

This technique has been used in Astrophotography for some time to improve overall image quality. The only limitation I see with the in camera process is that you are limited to only 2 or 3 shots. In Astrophotography they might often use 10 to 30 exposures (or more).

Pete







Attachment#1 (jpg file)
Attachment#2 (jpg file)

Pete

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A general, generic topic Usefulness of AutoGain feature on Multiple Exposure?? [View all] , Bravozulu , Tue 15-Jan-13 06:29 PM
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