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Old 21-08-2013, 04:59 PM
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Jon (Jonathan)
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Join Date: Nov 2012
Location: Canberra
Posts: 558
Originally Posted by ourkind View Post
Hi Angus,

I recently bought an Astronomic CLS filter for my 60d. The sales person told me not to bother pointing it at Globular Clusters or stars as the colours will be out of whack. It should only be used on emmisions nebulae etc.

I've also wondered wheather I could use it to point at Galaxies but I think not as it will cut out too much light.

Here are my results of the Tarantula with (red nebulae) and without (blue nebulae) the CLS filter. Both were taken from my balcony in Carlton under heavy light pollution.

Post processing was a little painful because everything came out RED RED RED, I was suprised and a little disapointed but others said that my results were good, so it beats me
You could look at it another way - the IR filter in your unmodded 60D cuts out a lot of the "natural" red from the Ha emissions of this nebula. The CLS allows this through while cutting out the orange/yellow sodium glare. So the "red red red" Tarantula is actually more "natural" than the blue one, when it comes to the actual spectrum being put out by that nebula. :-)
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