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L-extreme filter giving chromatic aberation

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#1 Celestial awe

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Posted 23 January 2021 - 08:20 PM

Hi all,

   I just purchased optolong L-extreme filter attached on a qhy 163c  and 10 in newtonian reflector. When I shoot with the filter my stars appear red at top and white/blue at the bottom and slightly oblong in shape which I assumed is chromatic abberation. How can I cure this or what can I do to address the issue?



#2 imtl

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Posted 23 January 2021 - 08:29 PM

Do they look like that in a single sub or in your stacked lights?



#3 Celestial awe

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Posted 23 January 2021 - 08:44 PM

It just appears in shorter exposed subs. With longer exposures or stacked photos it disappears.



#4 terrypaula

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Posted 23 January 2021 - 08:45 PM

Are you sure it isn't an internal reflection?



#5 Jim Waters

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Posted 23 January 2021 - 08:52 PM

Can you post a pic?  Need more information on your scope and any coma corrector you are using.



#6 Celestial awe

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Posted 29 January 2021 - 12:23 AM

I don't have any example pics on this pc but can get some if you need them later. First I should ask: What is internal reflection and what does it look like?

My equipment is a 10inch apertura newtownian reflector with a GSO coma corrector and a qhy 168c camera. By cc to camera spacing is still about 5 mm off but I have a filter holder ordered that will allow me an exact spacing for the camera to cc. The stars appear to have a reddish cap on top of them with bluer colors on the bottom.


Edited by Celestial awe, 29 January 2021 - 12:25 AM.



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