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Field of View help needed

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Hi I'm new to the site and astronomy with a telescope.

I've just purchased a Celestron Advance VX Edge HD 8" with an auto guide camera. While I'm waiting for it to arrive, I've been looking at DSO's I want to image along with the planets and I've found I list of (I think) all DSO's. Within the list it has the size of each object in degrees eg the Andromeda Galaxy has a angular size of 189'. 

What does this all mean, and what's the largest object I can image with this telescope, .7 reducer and a dslr. I have both 35mm and APS-C sensor. 

The list was found at www.deepskywatch.com


Thanks in advance for any help and advice you can give me


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