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Red stars?

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#1 New2lombard

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Posted 30 January 2023 - 11:13 AM

I'm a newbie to taking milky way pictures.

 

I'm using a Canon 7d mk2, Tamron 35mm F1.4 lens and a Move Shoot Move.  I took the attached at 8 seconds.

 

Why are some stars red/purple?

 

My next step would be take 50 shots and stack them, but I'm holding off because I assume that would just compound the issue...?

 

thanks

 

 

 

 

 

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Edited by New2lombard, 30 January 2023 - 11:14 AM.


#2 Alrakis

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Posted 30 January 2023 - 11:21 AM

Looks like chromatic aberration to me. Easiest way to take care of this is to change from f/1.4 to something like f/1.8 or f/2.2 or similar. That should reduce/eliminate the CA.

 

Chris


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#3 New2lombard

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Posted 30 January 2023 - 12:26 PM

Thanks - next time I go out I'll try stopping down 1.8, 2.2, 2.8 etc and see if it goes away



#4 matt_astro_tx

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Posted 30 January 2023 - 12:26 PM

That's CA or Chromatic Aberration as alrakis said.




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