Instruction: Answer the given question using the supporting document.

Input:
Question: Is this a fish-eye lens?
Document: (This doesn't sound good!) For instance, sometimes you take a picture over the side of a building, but with this lens you find yourself wanting to practically hang the camera off the edge in order to create a shot where the perspective is even more dizzying. What was happening during all this wacky hand holding was that light was entering the camera through the viewfinder (which wasn't at my eye) and this was throwing off the light meter.
No other lens out there can go as wide in a rectilinear fashion.
If you're looking to go as wide as possible, this is the lens to get.
Extremely sharp lens. Well made and should last for years.
I wish there was a filter for this lens. Due to its shape... you have to be very careful when you do not have the lens cap on.
However, you will not be able to use filters on this lens due to the shape of the front element.
have been using for about a month and love the lens. Clarity and sharpness is outstanding;  I highly recommend this.
Looking forward to giving this lens a great workout in an underwater housing in Dominica in Jan 2012.
Awesome Lens! work perfectly with my nikon d5000 and is a very usefull lense to take pictures of your work
Other than this issue, the lens is fantastic. If you do order this lens, stop it down and shoot a blank wall to check for manufacturing defects.
Answer: No...this is not a fish-eye lens. This is an ultra wide angle lens. Great for wide landscapes. If you are to close to certain objects, it can give somewhat of a distorted perspective. I have used this lens at outdoor parties, landscapes, night sky photos and sunsets, and architectural photography and love this lens.