How does a lens adapter work?

How does a lens adapter work?
Added (1). I want to put a fisheye lens on my FinePix S4830, which is a point and shoot camera. I know point and shoot cameras don't have interchangeable lenses, but i heard about things called lens adapters. Can someone please explain how lens adapters work, and how I can get a fisheye onto my camera? Thanks in advance. I am a complete camera noob by the way.

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Will a Nikkor 40mm f/2.8G macro lens be as good as a Nikkor 50mm f/1.8G lens?

I want to get a prime lens and I was wondering if I should get the 40mm macro or the 50mm. I do like taking pictures of small things (close up of flowers, plants, insects, etc.), but I also pictures in low light and portraits so I was wondering if the 1.0 difference in the f-stop will make the lens bad for low light photography. Both lens are about 200 dollars and as a broke college student it has to be one or the other.

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Blurry edges on Nikon S6800?

I just bought a Nikon S6800 last night. I wanted a camera that would be good in general, but one that would also take good pictures of my nails/nail art.

However, I am not able to take proper macro pictures. The edges of my fingers are blurry, and even though I've set the white balance, the colors are still off.

I'm considering returning it, but I'm sure (well, I hope) there's something I can do to fix it. Anyone have any tips as to why this is happening?

Thank you in advance!

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Which cam is better Nikon L28 or S2800? L28 has face detection. S2800 has HD 720p video?

Which cam is better Nikon L28 or S2800?
L28 has face detection.
S2800 has HD 720p video?

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Laser Autofocus on Speedlites?

Hi, i have a yongnuo Yn560 III, i've seen most professionals with canon or nikon speedlites, they use the speedlite's laser while focusing, so i was wondering if my speedlite has this feature and if it does then how can i turn it on?

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