It will probably affect it to some degree, but if you can shield your scope from any direct light, it will help. It kind of depends how much light goes upwards and illuminates the 'air' where your scope is pointing, and how much light is reflected off your surrounding and finds its way into your scope. Depending on just how bright it is, it will probably be more of an issue for your dark adaptation.
Best way is to go out and take some pics and compare them to the ones you have taken previously.
Adam
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