Do I need to get new lenses if I buy a full frame camera?

I currently have a Nikon D80 and am looking to upgrade to the Nikon D800. I have a few lenses that I've been using on my D80 (35mm 1.8, 50 mm 1.8, a wide angle, and the kit lens).

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70-300mm f/4-5.6 Di LD Macro Nikon-f any good?

70-300mm f/4-5.6 Di LD Macro Nikon-f
any good?
Added (1). I need a good cheap macro lens and this is the best one ive found so far, does anyone have any idea if its good?

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A nikon 35mm film camera?

What nikon 35mm film camera can you double expose without having to rewind the film? I have a nikon FE2 and you can NOT do it on that camera. So I am looking to buy another nikon film camera, that you and click the shutter without winding forward. It also will have to be compatible with the stander f-series lenses. I have a nikon d3200 and the fe2 so it would need to be able to share lenses with those. And preferably not to expensive of a camera (I'm still in high school so I don't have much money). If you know if any that would be awesome!

Thanks:)

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Which camera has the biggest and brightest viewfinder?

Which camera has the biggest and brightest viewfinder?
Added (1). Among present generation entry level DSLR's

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Is nikon 50mm F/1.2 lens compatible/direct fit with Nikon D5200?

Is nikon 50mm F/1.2 lens compatible/direct fit with Nikon D5200?

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Where to get a film lenses for my canon camera?

So i found out nikon cameras have their own separate lenses just for film pictures that have a vintage feel. And im wondering if canon cameras have a lenses for film/vintage effect? Im not looking for an effect im looking for a whole separate camera lens. If there is none, then do i have to buy an actual film camera?

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