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Mars - September 14, 2020

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#1 yock1960

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Posted 24 September 2020 - 04:58 AM

Another nice Mars image...I've lost count or would have if I was keeping track! This is from the first of four consecutive mornings of imaging, several of which were quite hazy, due in some degree to the western forest fires. Seeing was still good though. I've mentioned recently that I've noticed that my IR images seem a bit soft, which could just be focus issues, but it just occurred to me if the atmospheric haziness could be affecting IR captures, negatively?

 

Steve

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  • Mars_2020-09-14-0742_9-L.jpg
  • Mars_2020-09-14-0806_2-IR.jpg

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#2 happylimpet

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Posted 24 September 2020 - 05:22 AM

The colour image in particular is lovely. With that, who needs IR?

 

IR does seem a but soft - what filter is it? If an 807 or 850 longpass it looks about right though. IR should always suffer less from atmospheric seeing (the stuff you mention) but diffraction rears its ugly head reducing resolution.

 

Finally, have you tried deconvolution with imppg or something? your images look like they will benefit rather a lot as they have very good signal/noise.

 

Before / after on the Cloudynights jpg - originals will be much better! (using FITSWORK deconvolution)

 

post-47815-0-59699900-1600941280.jpg post-47815-0-59699900-1600941280_deconv.jpg


Edited by happylimpet, 24 September 2020 - 05:29 AM.

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#3 yock1960

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Posted 24 September 2020 - 05:37 AM

The colour image in particular is lovely. With that, who needs IR?

 

IR does seem a but soft - what filter is it? If an 807 or 850 longpass it looks about right though. IR should always suffer less from atmospheric seeing (the stuff you mention) but diffraction rears its ugly head reducing resolution.

 

Finally, have you tried deconvolution with imppg or something? your images look like they will benefit rather a lot as they have very good signal/noise.

 

Before / after on the Cloudynights jpg - originals will be much better! (using FITSWORK deconvolution)

 

attachicon.gifpost-47815-0-59699900-1600941280.jpgattachicon.gifpost-47815-0-59699900-1600941280_deconv.jpg

Thanks! The IR is 685nm bandpass, it's probably focus then. Certainly I could push the processing a bit more, but sometimes it just looks a little 'lumpy' to me, so I don't. Once the apparition is over or when this crazy frequency of opportunities returns to 'normal', I'm going to drizzle some of the nicer data sets, which may help.

 

Steve 


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#4 happylimpet

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Posted 24 September 2020 - 06:04 AM

Thanks! The IR is 685nm bandpass, it's probably focus then. Certainly I could push the processing a bit more, but sometimes it just looks a little 'lumpy' to me, so I don't. Once the apparition is over or when this crazy frequency of opportunities returns to 'normal', I'm going to drizzle some of the nicer data sets, which may help.

 

Steve 

Yeah agreed. Your processing has a beautiful natural look to it.

 

I think it must be focus on the IR then. 685 should be sharper.




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