Posted: 13/11/2016 at 12:50
Warning, here comes the science bit!
The trick to taking moon photos is called Lunny 11. It is a variation of the old Sunny 16 rule for daytime photography. Those of you old enough to have used film may remember the guide to exposure printed on the inside of the box which is based on Sunny 16. Basically it tells you how to use manual camera settings to get a good exposure.
On a bright sunny day if you were using film with a speed of ISO 100 then you set a shutter speed of 1/ISO i.e. 1/100th sec and an aperture of f16. Now the Moon is a rock in bright sunlight but the light it reflects has to travel a long way to get to us and some gets lost so we need a little more exposure for Moon shots. So instead of f16 we use the next brighter aperture of f11.
You can substitute other shutter speed/aperture combination to get the same exposure e.g. every time you double the exposure speed you need to open up the aperture to the next smallest number 1/200 and f8, 1/400 and f5.6 etc.
Those settings are a good starting point to get a good exposure of the Moon. If you just use the auto mode on your camera it is likely to get it wrong as the scene it sees is mainly black with a small bright bit. It tries to make the black bit lighter but then makes the bright bit too bright.