Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  8 bet CVn  ·  Chara  ·  NGC 4485  ·  NGC 4490  ·  The star Chara (βCVn)
ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti
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ngc4490 of 05.05.20 - help with "wave noise"

ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti
Powered byPixInsight

ngc4490 of 05.05.20 - help with "wave noise"

Equipment

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Acquisition details

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Description

This image is the sum of 163 120 secs unguided subs taken on the 5th of may with an unmodded NIkon d5300, a TS65F, on top of a Ioptron CEM60 (over a Newton 250 F 3.9).

Version 1 is without any processing. Version 2 is after processed with DBE of Pixinsight. Software has done a wonderful job of correcting gradient, but was not able to correct the "vertical wave" noise.

If some of you would like to process and correct this image, you can download both original and processed file.

Thanks for looking

Comments

Revisions

  • ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti
    Original
  • ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti
    B
  • ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti
    C
  • Final
    ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti
    D

B

Description: Versione 2 after DBE

Uploaded: ...

C

Description: heavily stretched image to show vertical waves

Uploaded: ...

D

Description: Applied Pixel Math on Pixinsight using the formula described below:

https://www.astrobin.com/c7bgwq/?nc=collection&nce=910

results are very good! - Thanks to Gary Imm and his formula.

Uploaded: ...

Sky plot

Sky plot

Histogram

ngc4490 of 05.05.20 - help with "wave noise", Stefano Ciapetti

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