Deminishing returns.....

Started 3 months ago | Discussions thread
Astrozoid Contributing Member • Posts: 846
Re: Deminishing returns.....

1llusive wrote:

I've shot a similar/better image with 17 x 1 minute exposures.

It is always so meaningless to mention a comparison like this.

First of all, IF you are correct, and it's 17 minutes total, a 1-minute sub is 12 times as long as a 5-second sub. So it's not an apples to apples comparison to start with.

A 5-second sub with a strong light-pollution filter at ISO 400 with that camera might not even be sky-noise limited. Think about that.

Second, it is completely useless information without telling us how dark your skies were, or what exact equipment you shot it with. Maybe you used a 12-inch f/2.8 scope. Maybe you shot under Bortle 1 skies. Maybe you used a camera with twice the quantum efficiency.

Plus, the op said he was guiding. Who guides 5 second exposures?


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