My camera wont auto focus?

I have a Nikon d5100 with a Nikon 50mm f/1.8D AF Nikkor Lens. I try to go to the info section where i am told there is supposed to be a section sayin AF or AFS but there isnt. Do I have the wrong type of lens or am i doing something wrong?

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Is the Lumix LF1 a good camera for low light?

Is the Lumix LF1 a good camera for low light?
Added (1). It seems more attractive to me than the Powershot S110 because of the EVF

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Do you have to add PC syc and HotShoe voltages together?

I have a Nikon D200 and two flash units. One attaches to the Hotshoe and the other with a PC sync cable. The one on the cable is old and has a 234V trigger. The other flash is a Nikon SB-20 with a 5.5V trigger. Will I have to add these voltages up to see if it's under the rated max voltage (Which is 250V. I know they add up to less than that but I'm a bit oo err with the old flash by it's self) or do the connectors have their own separate max voltages? Thanks

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Meter app in my mobile VS Nikon fm2 meter. Which one should i trust?

Meter app in my mobile VS Nikon fm2 meter. Which one should i trust?
Added (1). for example:
light meter app shows ISO200 f2 T250
but FM2 goes negative with the same setting

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Is the YONGNUO YN-467II compatible with Nikon D3200?

I want to buy a cheap flash for my Nikon D3200 and i want it to have TTL.
I was wondering if the YONGNUO YN-467II compatible with my camera (NIKON D3200) or not?

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