Is there supposed to be a little round circle thing etched into the lens that almost looks like a water spot or something?
930138
Not on either the surface of the lens (back or front), nor anyplace inside the lens. Check to see if there is anything on the surface, although even if there was it should be out of focus. Are you seeing this through the viewfinder of your camera (or LCD display), or when you look through the lens (detached from the camera)? If you do not see it with another lens on the LCD display, then the problem is with this new lens. If you do see it with other lenses, then possibly dirt on the camera's sensor. In either case, try to exchange the product.
1850541
You should check your current lens size, there should be some printing on it about your lens size.
2171318
As I recall, there is a piece on the lens that has to unscrew and be removed before the lens hood will attach.
187362
There is a clear lens and a tented one. If you get both it shouldn't matter. I think this is the clear one.
1762307
Yes, there is some vignetting as there is with many fish-eye or wide angle lenses. I think that it is the nature of things rather than a flaw.
558030
The outermost lens element of my G-10 is now scratched, all scratches aligned in the same direction. I'm not completely sure, but I suspect dirt or dust got caught between the external lens aperture (the thing that functions like an eyelid when the camera powers-off) and the lens element. I'll be sending it to Canon shortly.
1092484
They come out smudge. The pictures are not as clear as you hope they would come about to be. My lens just came like that, I'm not sure about the others
73690
I've been using this lens for several months now and I do not hear such a sound as described. You should probably have it checked out.
133731
Technically it is not but for all practical purposes it is. Though with a true fisheye lens you have more defined rounding along the edges.
2008581
Well, there are subtle shadows with any of these lenses. This doesn't bother me though. The lenses are really fun, especially the fish eye.
1956073
Hey Aaron, common mistake. What you need to do is set the actual aperture on the lens ring to 22 and the lock it on that value so that the little red line aligns with the 22. This happens because you are using an older non focusing lens on a newer body. Problem solved. Have fun, that is a fantastic lens.
1534406
The lens is an autofocus, I don't understand you about "rectangular fisheye" If you are asking about the circular aberration, the lens has aberration.
1172630
It all depends what the diameter of your lens is..........it should be noted on the lens somewhere
281435
When mine did that, it was simply a dirty lens. I cleaned it with a microfiber cloth. As the lens is plastic, is it possible that some substance came in contact with it and turned it cloudy? Sorry, these are the only simple things I can think of
841669
Have not had a problem with that. There is a distinct transition when you extract the lens.
469590
The lens I have are glass, and metal rings. They can turn for different effects.
2194128
It does. This was actually a gift for my son. After several months of owning it he noticed a dark spot on the lens. We sent it back to be repaired and they sent him a brand new one.