Bolton Astronomical Society

How faint with a 4 inch Apo?
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Author:  DRatledge [ Sun Apr 26, 2015 3:01 pm ]
Post subject:  How faint with a 4 inch Apo?

Below should be the result of a stack of 5 hours worth of the globular cluster Pal 4 with a 4 inch apo and Canon 60D (its the small blob with red stars in the middle). This is the second most remote cluster at 400,000 light years. The brightest star is 18th mag so it looks like a 4 incher can reach about mag 19 from our skies.
The image has had just the standard processing ie colour balance, gradient removal and colour stretching. It needs more effort to smooth out all the colour noise but I was amazed that such a small scope could get this faint object.

pal4-4inch.jpg [ 119.84 KiB | Viewed 2994 times ]

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