Nikon lens difference?

I went to a camera shop today & was looking at the
Nikon AF NIKKOR 50mm f/1.8D Lens and
Nikon NIKKOR AF-S 50mm f/1.8 Lens

The guy told me there the exact same lens but ones just more expensive ($299 vs $129)

What's actually the difference between them?

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How would you stop a column of tanks?

Added (1). Photo of protester in Tiananmen Square, 1989

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Nikon D3000 'lens not attached'?

Hi, I'm sure this has been asked thousands of times, but there are so many answer of no relevance, I thought I would start from scratch.

I have just bought a Nikon D3000 and the sigma 24-70mm lens. This isn't for myself and I have no clue about cameras, so any help would be appreciated.

It says 'lens not attached' when in anything other than manual mode.

When in manual mode, i take photos but they are black.

Anyone had this problem and found the solution? Am I using entirely the wrong lens?

Thanks in advance.

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Whats the difference? Nikon D3200 and D3200 NVR?

i'm looking at these 2 DSLR camera's, the only difference being the model numbers, but what does the NVR mean? What's the difference over the other model?

Nikon D3200
http://www.argos.co.uk/static/Product/partNumber/5598263.htm

Nikon D3200 NVR
http://www.argos.co.uk/static/Product/partNumber/2598077.htm

the only difference i can find is the model number, but what is the NVR?

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Where can I find best Nikon D5100 Digital SLR Camera Best Price Review?

Where can I find best Nikon D5100 Digital SLR Camera Best Price Review?

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Best Nikon lens for low-light wildlife photography?

I'm going on a safari soon and need a good telephoto lens for my Nikon D3100. I was going to go with the basic 55-200mm, but the maximum aperture is only 4, and on the 55-300mm it's 4.5. The animals are out early in the morning and late at night, so the light won't be great. I've heard that for low-light wildlife photography you need at least an aperture of 2.8, but the 70-200mm f/2.8 VS and VSII are both really expensive. Do I really need the f/2.8? Also, will 200mm of zoom be enough? Thank you!

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