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Why not download Ron Wodaskis CCD Calculator and have a play with that
You can select a bunch of different telescopes and cameras and get a good idea of the field of view using the various popular DSO targets he has in the programs library and then you can see for yourself what works best for each particular object.
You can see the full object and then a rectangular box around it representing the size of the image using your choice of equipment.
As can determine for yourself - there really isnt a one size fits all.
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