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Since we are talking about low light performance...

Started Jan 21, 2022 | Discussions thread
SigmaChrome Forum Pro • Posts: 15,728
Re: Since we are talking about low light performance...

DavidWright2010 wrote:

SigmaChrome wrote:

A fascinating study, David.

I'm not sure if I understood you completely... did you actually try stacking the SD1M images?

I was under the impression that the SD1M makes a dark frame exposure for shutter speeds 30 secs and over but I don't know how you would access those frames. So I imagine that you would have to take your own dark frames anyway.

I've been planning on using my GFX 50S II for astro work, but I haven't done so yet. The longest lens I have is the 100-200 f/5.6 which is probably a bit slow.

I didn't show the stacking results because the further away you go from the raw image, the more opportunity to introduce some bias in the workflow.

But, you asked, so I redid the processing for stacks of 14 images (all that I took with the SD1M), making all the steps as similar as possible,

LHS single SD1M exposure,, Middle 14 SD1M exposures, RHS 14 D5600 exposures:

I left the background above black so the noise (and faint, real features) are visible.

That looks pretty impressive to me, David. The star colours look fairly good too.

Edit: It was very late last night when I responded. I just re-read your post. For some reason I thought the RHS was the final SD1M result, but now I realise it's not.

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Regards,
Vitée
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