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NGC4395

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#1 Tayson82

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Posted 17 April 2019 - 08:02 AM

IOptron CEM60-EC, TS APO100Q, QHY695A

Poland, 2019-04

50xL@5min, ~20xRGB@5min, 7xHa@15min

 

full: https://astropolis.p...d1db1a5c074.jpg

 

ngc.jpg


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#2 Astroman007

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Posted 17 April 2019 - 09:03 AM

Gorgeous! Rich with rose-colored emission nebulae and blue with star-forming regions. Love it.



#3 Dan Crowson

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Posted 17 April 2019 - 09:19 AM

Another really nice image of this CVn galaxy.
 
One thing I do notice is that a lot of your stars are really blue? Your Ha really added a lot this this image (mine is in LRGB) but I notice some of my yellow/gold stars tend to be blue in your image.

Dan



#4 Tayson82

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Posted 17 April 2019 - 09:40 AM

I have problem with blue stars, and a coud not solve it.

In this image I used photometric calibration in Pixinsight.



#5 Dan Crowson

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Posted 17 April 2019 - 03:48 PM

It is a nice image regardless. I only noticed because I checked my library to see if I had imaged it before.
 
Thanks for posting,

Dan



#6 schmeah

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Posted 19 April 2019 - 05:56 PM

Excellent job on a fascinating galaxy.

 

Derek



#7 jhayes_tucson

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Posted 19 April 2019 - 10:04 PM

I have problem with blue stars, and a coud not solve it.

In this image I used photometric calibration in Pixinsight.

That's a really nice image, but I agree that the star field looks too blue.  Be careful about PCC.  It doesn't always do the right thing and the results depend a lot on the white balance reference that you pick.  You might try doing a standard white balance on this data set using just the stars for the white reference.   I think that you might get a better result.

 

John


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#8 scopenitout

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Posted 21 April 2019 - 05:13 PM

I love it. Certainly not many done as well as this one.

#9 Tayson82

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Posted 24 April 2019 - 09:39 AM

You might try doing a standard white balance on this data set using just the stars for the white reference. 

How to do this?



#10 jhayes_tucson

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Posted 24 April 2019 - 10:12 AM

Tyson,

I do it in PI by first using the background to set the black level.  Then I use "structure detection" in the ColorBalance tool.  Generally a structure level of 5 will work but that depends a little on the size of your stars.  

 

I don't know what software you are using so you'll have to check to see if there is a way to select the stars for white balance.  I can imagine a way to use a layer mask in PS to do it but it would be a bit more difficult.  If you are serious about astro-imaging, the best money you'll ever spend is be an investment in PixInsight; although, you'll also have to commit some time to learn it.  It has tremendous capability but it's hard to learn completely on your own.  You'll need at least Warren Smith's book and you'll need to spend some time watching YouTube videos.  You can also take an on-line course or a live course, which are more expensive but you'll get up to speed a lot faster.

 

You've got some really nice data and balancing the color better will take your image to the next level.  Good luck with it!

 

John



#11 Michael Deger

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Posted 24 April 2019 - 11:20 AM

Very nice capture!

 

All the best

Michael

 

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