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Stellarium has a built in tool that will do it for you. You just plug in your equipment "camera, scope" being used and it will give you the field details, plus show you the field on the sky diagram, wherever you aim. If you zoom in or out it will adjust the sky field.
If you have more scopes and cameras, it will calculate and display for those as well. If you want to compare, two cameras, it's just a click away.
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