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Author Topic: Canon 450D imaging with 50mm 1.8 lens  (Read 797 times)

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Offline gfletcher

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Canon 450D imaging with 50mm 1.8 lens
« on: 13:44:46, 09 April, 2016 »
Hi guys
I have an unmodded 450D which I have fitted an Astronomik CLS clip filter.
I took some sample images using my Canon 50mm lens set at f2.5
The resultant lights came out with an extremely mid blue background.
I put the 5 light frames through deep sky stacked and the resultant tiff image was still quite a mid blue background.
Is this normal when using a CLS filter and if so how do i get rid of the blue background when I post process in Photoshop CS6 ?
Thanks
GRAHAM
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Offline Celestron8g8

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Re: Canon 450D imaging with 50mm 1.8 lens
« Reply #1 on: 17:25:32, 07 June, 2016 »
Just out of curiosity what setting was your WB set to ? Some WB settings cast a blue hue  about an image . You might play with different WB settings and see if it makes a difference .
-Ron

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Offline ChrisLX200

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Re: Canon 450D imaging with 50mm 1.8 lens
« Reply #2 on: 20:03:25, 07 June, 2016 »
Yes it's quite normal to get a strong blue colour bias and it's subtractive (i.e., you lost a lot of red which contained the bulk of the 'light pollution'). Different LP filters produce slightly different results though and my IDAS is not quite so harsh - but still a blue bias. Your options here are to re-balance the image in post processing (knock the blue down/boost the red) but in so doing you may well find the red channel becomes mottled and grainy. You could also try biasing the White Balance during image  aquisition (set it to 'warmer' tones). In short, there's no free lunch with LP filters!

ChrisH
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