Sony alpha a 580 perform twice as good as nikon d7000 in iso 6400 low light?

Http://www.imaging-resource.com/PRODS/AA580/FULLRES/YDSC01106.HTM

http://www.imaging-resource.com/PRODS/D7000/FULLRES/YDSC_1710.HTM

Canon to Nikon adapter?

I recently found a couple of old canon lenses in my grandmas attic, and I was wondering if it is possible to buy a converter so they will fit on my Nikon D60…
There's a Canon FD 35-105mm 1:3.5-4.5, and a 70-210mm 1: 4.0
If anyone can provide any links or additional information, it would be greatly appreciated!

How important is autofocus when you are just shooting landscapes and macro?

I will be buying my first DSLR camera soon. I was pondering over whether to get a cheap, entry level camera and a good lens or a good, full frame camera and a fairly cheap lens. I have opted for a good lens with a cheap camera. I favour nikon and will go for the Nikon D3100 but it has no built in autofocus motor and this is a problem with the lens i wanna buy which is the Sigma 28mm f1.8 Aspherical Macro EX lens. This lens also doesn't have a built in motor so i will have to use manual focus. Will this make life difficult for me when i'm shooting macro and landscape? Also, any recommendations will be appreciated.

Is the Nikon D3100 a worthy replacement for my elderly Nikon D40?

I have a Nikon D40 and they are still fetch quite good money on eBay, I figured that if I hang on to it for another 12 Months it will be worth next to nothing. I was looking at the New Nikon D3100. They have come down a bit in price since there launch (about 9 Months ago)
Cheers

Best lens kit/combo for Nikon D90?

I love my new Nikon D90. I'd like to buy up to three lenses to go with it. I travel a lot, like landscape/nature photography, and macro work. I'm not really into portraits. I rented the Nikon 70-300mm, which I love; Tamron 90mm, which, considering is not a Nikon, takes rather decent shots; and the Nikon 16-85mm, which is also a great lens. I've read that a must have is a Nikon 35mm lens as a travel lens in conjunction with a 16-85mm. Would this be an accurate statement? If you had your choice, what would be the three must have lenses in your camera bag? I'm on a budget, so try to keep the lenses at under $700 each, please.

Photography help? (extra characters)?

Okay, so basically, I'm going to be taking pictures of this fashion show that's going on at my church, and I wanted some suggestions about a few things.

Is it "bad" if I were to leave my camera (which is a Nikon D3100) on auto the whole time and never doing anything manual, even though it's a fashion show?

The lighting in the church is kinda dim. If I were to use my manual settings on my camera, what would you suggest I use?

Pentax k r performing close to nikon d7000 at iso 6400.how is that possible?

Http://www.expertreviews.co.uk/gallery/reviews/1281262/pentax-k-r-with-dal-18-55mm/138262

http://www.expertreviews.co.uk/gallery/reviews/1281652/nikon-d7000-18-105-vr-kit/139879

Added (1). I would say pentax k r performing even better than d7000 at iso 6400

Added (2). Ethan don't believe in brand, trust your eye

Which DSLR would be the best for its price?

Hi, I'm a 14 year old beginner photographer.i'm planning on buying a DSLR preferably from Nikon or Canon. I've done a little digging and I like the Nikon D90 a lot. However, I've also came across the Canon Rebel T3i, which is an 18 mega-pixel camera with a price lower than the Nikon D90. Since I've played around with the D90 before, I know that the D90 has exceptionally clear image performance. Would the Canon Rebel T3i have good image quality too? What about other Nikon/Canon models?

Cleaning sensor on a Nikon D80?

So i noticed this little spec begin to appear on my camera. I took out the lens, cleaned both ends of the lens and the inside of the camera and it's still there. So unfortunately I think it has something to do with the sensor.
I want to know if this is easily fixable and what the costs of repairs could be.

Added (1). Also, what happens if there really is something wrong with the sensor and it isn't a spec of dust? Then what?

How large is Nikon d90 compared to Pentax k-x?

I want to buy a Pentax k-x camera online, but i'm not sure if it's too small for my hands or not. Camera shops in my place don't sell a single k-x and i don't know anyone who has one too, so i don't have the chance to try using it. By Wikipedia's definition, my hands are average in size. I've tried using a Nikon d90 once. I think its just big for my hands. Is Nikon d90 slighty larger, or very much larger than pentax k-x?