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 Post subject: Cassiopeia A
PostPosted: Sun Dec 14, 2014 2:47 pm 
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Location: Adlington
Cassiopeia A might be seriously faint but it is in reach of 4 inch apos. Below is the 4-inch + Canon 60D shot used for the RGB of my LRGB image. It is amazing (to me at least) that a 4-incher can record it so clearly. A UHC filter - the narrower the better - is ideal.


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 Post subject: Re: Cassiopeia A
PostPosted: Fri Dec 19, 2014 5:17 pm 
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Below should be the optical discovery photograph of Cass A taken with the Palomar 200 inch by Walter Baade in 1953. Shows how far we have come in 60 years when a 4 inch telescope and a Canon DSLR in Lancashire can also record it. (I have used the Palomar red and blue plates to produce a colour image)


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