Author Topic: ngc4236 C14 hyperstar + EOS 60Da  (Read 259 times)

Offline mmnb

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ngc4236 C14 hyperstar + EOS 60Da
« on: 2019 July 23 23:51:39 »
Stars are rounder than last time from subframe selector stats and PSF, and seem less 'painful' visually. I hope this was a result of a tiny bit of hyperstar adjustment and persists in my other datasets I've acquired since.

This was 150s x 24, would love any advice on improving.  Sharpening with deconvolution or multiscale linear transform didn't help much, the galaxy was quite noisy so just applied gentle denoising. A touch of extra curves adjustment in GIMP.

Offline Niall Saunders

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Re: ngc4236 C14 hyperstar + EOS 60Da
« Reply #1 on: 2019 July 24 08:57:31 »
Nice image, but my first thought was  that your focus might have been 'off'?
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Niall Saunders
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Offline mmnb

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Re: ngc4236 C14 hyperstar + EOS 60Da
« Reply #2 on: 2019 July 24 10:15:55 »
It is possible. At the time acquired this data I was using the focus routine in maximDL, and realized I needed backlash compensation.  Not sure if I fixed that before or after acquisition; I can see it now too that you point it out.  I'll keep an eye on in it as I go through my other datasets I've acquired over the last few weeks.  EDIT: I have a 'proper' focus routine in place now that moves to a focus star every 15 or so minutes and focuses via focusmax (I am still kicking the tires since the std devs in focus position seem large).

Offline Geoff

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Offline mmnb

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Re: ngc4236 C14 hyperstar + EOS 60Da
« Reply #4 on: 2019 July 24 11:26:08 »
Can you clarify? This image was processed only with pixinsight.
EDIT: Ah I suppose there was another piece of free software involved in the very last step in terms of cropping and curve adjustment.  These were very very trivial changes (easily done in PI) and only mentioned for accuracy.
« Last Edit: 2019 July 24 15:38:25 by mmnb »