Will these lenses fit my camera?

will the Nikon 50mm f/1.8D AF Nikkor Lens

AF-S NIKKOR
50mm f/1.8G

or Nikon AF Nikkor 50mm f/1.8D Wide Angle

fit my Nikon D5100?

i read somewhere that some of them wont fit?

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What is the newest version of a canon dslr camera and what's the newest nikon dslr camera?

Also which would you recommend? Which is better for landscape photography? Which is better for sports? Which is better for portraits? I'd like all these answered thanks!

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How to use manual flash on a dslr?

i want to buy one of those flashes that hook to the top of a DSLR. (i have a nikon d3200)
I'm saving money and buying a cheap one that is manual only, no TTL. I've never used a flash before, not even the one built in the camera.

i want to know how you know what brightness to use on the flash, and what aperture, iso, and shutter speed to use to correctly expose a picture.

and I'm not doing studio portraits. I need more light for things like taking a picture at a birthday party or something. I'm going to be in situations where i can't take 5 photos and mess with the flash in-between and change settings with each shot. One, two photos, with hardly any time wasted is what i need, but i also need to expose correctly with a manual flash and i don't know how to do it.

the flash i want to buy is called "DBK DF-400 Flash Speed light". Its on Amazon.

so how do you know how to get correct exposure with this flash?

i tried googling it but all the tutorials on google and youtube are pretty bad. And i need things explained very simple.

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Why is my compact shooting terrible videos at 720p HD?

I have a Nikon L27 compact camera, and I'm trying to shoot videos with it. I've set the setting to 720p (this appears to be the highest resolution setting), and on the 2.7 inch display screen it looks fine… Although that could be because the screen is so small. However simply transferring the files to my computer and watching them fullscreen there (keeping in mind that my screen is only 10.1 inches!) they look really, really grainy and awful. Why is this and how can I fix it? Also are there any fairly cheap camcorders you could recommend?

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How to set my nikon d700 to autofocus when I hold the shutter button half way?

My d90 does this and I can't figure out how to do it with the d700. Please and thank you! :)

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Astrophotography help?!

Does anyone know where I can purchase a gps controlled refractor telescope that is compatible with my Nikon D3100?

Additional Details:
I only have the Nikkor 18-55mm lens kit.

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Which Camera is best Nikon D3300, Nikon D3200, or Canon EOS 70D?

I just need a camera that takes a good picture and good videos. I don't need any fancy features or add ons all I want is a camera with a good lens that is durable and simple. Which camera has the best resolution and gives the best pictures and videos?

Read more: Which Camera is best Nikon D3300, Nikon D3200, or Canon EOS 70D?