Wrong lens size for slr?

I recently ordered a fish eye lens for my nikon d5000 and its the wrong size. Is there any kind of attachments i can add to it to make it fit?

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The best Nikkor lens for my Nikon D90?

Happy with my D90 camera with 18-105mm lens.
I consider a good start in macro photography, with Original Nikon lens, best suited for my D90.
Activity will be like flower close ups, and occasionally insects.
Appreciate guidance; thank you.
Alternative might be a compact system camera with a dedicated macro lens?
Rgds
Guido

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Help regrading exposure(Photography).Read below?

Hello,
I am new to photography world and i recently purchase Nikon D3200.
Well,my question is how to balance the exposure of a photo in different situation.
I read an article of Sunny F16,where it states that at F16 your shutter speed will be 1/ISO ie if you set ISO - 100,then shutter speed will be 1/100 or 125 at f16.

Then what about shutter speed at other light condition such as when i set aperture to f11(bright cloudy),f8(cloudy),f5.6 etc and ISO is 100.

Is F16 rule in different light condition work-
eg) suppose i set f8 ie overcast and ISO - 100 then shutter speed will be 1/400 or 1/500.

I tried in app called CAMERASIM, but failed to get right result.

Please help.
Thanks.

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What are some good books in learning photography?

I am sort of an amateur photographer and I use a Nikon D5100. I was at B&N just a few days ago and found this book called "The Digital Photography Book" by Scott Kelby and it happens to have good ratings. I want to learn more of photography and I want to see some great books I can check out. Thanks!

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