Nikon crop sensor on D7000?

I currently own a nikon D90 and i know it has a crop sensor. Does the nikon D7000 have a crop sensor, and how much is cropped off… 1.5? I'm not to sure.

How to set aperture with cheap extension tubes on the nikon d3100?

Is there a way to set aperture on the nikon d3100 when using cheap extension tubes? I have read that you can set aperture by holding down the depth of field preview button while attaching the extension tube, However the Nikon d3100 does not have a depth of field preview button. Is there any other way to set aperture with cheap extension tubes?

Added (1). By the way, I don't have manual aperture adjustment on my lens.

How digicams has more optical zoom?

Like nikon p500 has 36X zoom and nikon D5100 with 18-55mm lens could have less, what is the major difference as i'm starter

Is this camera any good?

Http://www.bestbuy.com/site/Nikon±+12.3-Megapixel+D5000+DSLR+Camera+with+18-55mm+Lens±+Black/9311755.p?id=1218082646627&skuId=9311755

Do I need to buy any other lens or anything else?
Please explain I'm new to this haha.

Added (1). What is the downside of this lens?

What lens would I need to take close up pics of a watch?

Like this

&imgrefurl=http://www.edwud.com/2009/04/03/kahuna-watch-macro-photograph/&usg=__UXpABA3iS6IGMLcI2al-i_vc3hU=&h=531&w=800&sz=99&hl=en&start=0&zoom=1&tbnid=KgnStlIYcB3buM:&tbnh=130&tbnw=179&ei=8tj2Tc7rG4LYgQfem5ngCw&prev=/search%3Fq%3Dwatch%2Bmacro%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1280%26bih%3D709%26tbm%3Disch&um=1&itbs=1&iact=rc&dur=432&page=1&ndsp=24&ved=1t:429, r:2, s:0&tx=108&ty=51&biw=1280&bih=709

or this

I have a nikon D80 DSLR and I don't want to spend more than 100 bucks. Preferably manual lens but good and sharp!

What is the difference between these two cameras?

Http://www.bestbuy.com/site/Nikon±+12.3-Megapixel+D5000+DSLR+Camera+with+18-55mm+Lens±+Black/9311755.p?id=1218082646627&skuId=9311755

http://www.bestbuy.com/...6300050015

I'm really hoping to go with the 600$ one LOL. And do i need any other accessory with this camera?

How to take good action shots with my Nikon d3100?

I'm a beginner and i know its a good camera for people like me who don't know much about photography. But i'd like to know how i can take an action shot without it being completely blurry… At this point all i can do it use it on auto and even if someone moves the smallest amount its completely blurry. What do i do to make action shots clear?

What NIKON lens to buy next?

Hi, I'm thinking of buying a new lens for my Nikon D60. Any suggestions?
I already have the Nikon 18-55mm, Nikon 55-200mm, and the Nikon 35mm f/1.8G.

Where to learn photography?

I just bought myself a Nikon D3000! I'm interested in learning more about the camera, techniques and etc. I was wondering if there are any good forums/websites that might inspire and help me?

How to use an external Microphone with ipod touch 2nd gen?

As a hobby I make videos and I use a Nikon d3100 to record my video however the audio sucks on it and you can hear the camera focusing. So I bought an audio technica ATR6250 microphone to record my audio. My plan was also to purchase a digital voice recorder and just plug the mic into that to record my audio separately. I was thinking the other day and thought that I might be able to use this mic with my ipod touch to record the audio instead of spending the money on a digital recorder. Is there any way to do this, when I plug it in and go to the voice memos it doesn't pick up the mic. I know that they sell mics specifically for the ipod touch but I would like to use the one that I already have.