Is a tripod. The -2 to +2 is the sensitivity to light and how light or dark you want the picture.
Next you will need a very long exposure. Now you don't want to touch the tripod wheen the shutter fires. What you will need is a remote shutter so you don't jar the camera. This or you can use your cameras delayed timer option. Use you cameras longest shutter setting and you should get what you want.
I have a Sony Cyber shot DSC-f717. I like everything about it except I am not sure how to take good night shots, which is important to me. I live on lake superior and when the moon is full or near full the moons rays over the water are breath taking. I just now learned, thanks to this site that I should bump up the ISO. What about sharpness? My camera gives me a choice of -2, -1 0, +1 and +2. I am not sure where I should have this set at and exactly what it does. If you have any suggestions or even could recommend a good digital camera for this purpose that is fairly easy to use please do. Thank you!! Is the camera I have suitable for what I am wanting to do??? Wayne

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