Just want setting for a moon picture
I assume you want a picture of the moon and don't particularly care what the sky looks like.
Consider a full moon. Just what are you taking a picture of? It's a landscape, right? Mountains, craters, etc. All under a bright midday sun without a cloud in the sky (the sky on the moon, not your sky). So what if the moon's a quarter of a million miles away from you, it's under the same sun. Yeah, it's a quarter of a million miles farther from the sun, but given the nearly one hundred million miles between the earth and the sun, the difference is negligible.
There's an old photography rule called the "Sunny-16 Rule." It says that the proper exposure under sunny conditions is f/16 at a shutter speed that is a reciprocal of the film's ISO rating. So, at ISO 200 the proper exposure would be f/16 at 1/200 second (or equivalent, such as f/11 at 1/400 second). You'll have to switch the camera to the Manual exposure mode to do this. Ignore anything the camera's light meter says.
Use this as a starting guideline. Take a picture and review it on the screen. Don't worry about the sky going pure black. You don't want the highlights to get blown out, or the moon will look like a white blob.
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