Nikon camera (d5100) blurry photos on automatic setting?

I've had the d5000 for a few years and just bought the d5100 on a black Friday sale. I ordered a lens filter thing right after I got it, and it arrived like a week later. The first week, the camera took great pictures. As soon as I put the filter on, the pictures were all blurry on automatic setting. So I took the filter off and they are still blurry. I'm sure I didn't touch or scratch the lens while putting the filter on. I even cleaned my lens, and it's still blurry. It's the lens it comes with- the Nikkor 18-55.It's not the best lens out there, but it should still work, especially on automatic settings. Ideas on how I can fix this? Trying to take Christmas card photos of the kids and everything is garbage!

Is $700 a fair price for Nikon D5000 plus 2 lenses and a bag?

I'm selling my Nikon D5000 Digital SLR camera, plus 2 lenses and a carrying bag. They are all in perfect condition and have not been used very much. Is $700 a fair price for all of it together?

What is the difference between these two camera lenses?

I'm just beginning to learn all about my Nikon d5000, so excuse me if this question is dumb.
I'm looking into a cheaper fisheye to take travelling, as I'm just starting out and don't want to spend the money on the nikon 10.5mm. I'm looking on amazon for the rockinon f/3.5 8mm fisheye here:

Rokinon 8mm Ultra Wide F/3.5 Fisheye Lens with Auto Aperture and Auto Exposure Chip for Nikon AE8M-N
http://www.amazon.com/...006O7158O/" class='ext_link'>http://www.amazon.com/...006O7158O/

but then noticed there was this lens:

Rokinon FE8M-N 8mm F3.5 Fisheye Lens for Nikon (Black)
http://www.amazon.com/Rokinon-Fisheye-Aperture-Exposure-AE8M-N/dp/B006O7158O/

so clearly the difference is one has an auto exposure and auto aperture chip, but i'm not really too sure what that means and if it even applies to my lower end nikon? I know this lens would be manual on my camera which is fine, but would this AE lens make a difference? I'm confused!

Buying a camera on eBay. Warranty?

The camera I want to buy (Nikon d3200) is $1, 500, but online if I order from Australia they are only $500.Is it okay to buy a camera from overseas, because the warranty would only be valid in Australia? Is this too risky?

Is nikon d3200 compatible with sony n50 lens?

Sony 3.5-6.3/18-200 zoom

How to take a colour photo with black and white background with nikon d3100?

How to take a colour photo with black and white background with nikon d3100?

How to set up multiple exposures on canon EOS?

I asked earlier about nikon d3000… But I decided to use the canon EOS… I want to ask how can i set up multiple exposures on it manually… About the specific measurements… I'm very new to this and I would really really appreciate the help… Its my senior design studio… Thank uuu

Who has a Nikon D3200? How do you like it?

I'm looking to purchase a nikon and I kind of like the nikon d3200. But, I kind of want your guys' opinion.

What would be the next best lense after a 18-55mm?

Right now I have a Nikon D3100 which comes with a 18-55mm lense. I'm looking to buy another lense, but I'm not sure if I should get the 55-200mm or the 70-300mm. I'll be using it for sports sometimes, and just things I couldn't reach before with the 18-55m. Anyone have any experience as to which one they like better and why? I'd like to keep it under $200 also. I've found a couple on amazon.com.

Video shooting with Nikon D7000?

I have a Nikon D7000 DSLR. When I shoot video, each clip I record only allows 20 minutes. I want to take off the limit. I want to shoot as long as it takes. Both my cards are 32GB, and they can do 3 hours of recording each. Does anyone else have the D7000 that can help me on this?