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Hi Deena.
I did take a photo of the moon a few weeks back but, I think I've delete the image since, as I don't see it on my desktop. I was using a Tamron SP 500mm mirror lens that is fixed at f/8. I can't alter the aperture. I also had a x2 teleconverter fitted to the back, making it a 1000mm f/16 lens lol.
I was still able to get about 1/160 sec by raising the ISO up to around 500.
Its essentially a juggling act. If your shutter speed is too slow, up your ISO or increase the aperture from f/11 to f/8, to either make the sensor more sensitive or allow more light in. Or do both. The moon does move quite quickly, as you'll notice in live view with the x10 zoom as it travels across your screen. The faster you can have the shutter speed, the better, as you will decrease the motion blur.
Experiment with different ISO settings first and see where the upper limit is with your camera, before the noise starts to ruin the image. Then knock it down a notch. Depending on your camera this may be ISO 800 or much higher, if you have a newer camera that has improves SNR or a full frame sensor. This would be my first port of call. If you're still not achieving a fast enough shutter speed, then open the aperture a little.
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