is this a fresnel lens?
937457
I don't recall if it was advertised that way but it looked like one. It did not provide a clear image and so I returned it.
876155
http://www.ephotozine.com/article/nikon-10-5mm-f-2-8g-ed-dx-fisheye-interchangeable-lens-review-18382 Hope this helps. Either way, it is still a cracking lens and I have never been disappointed with it as of yet :)
1168519
Yes there is but I would get a glass one instead of this plastic one. What you look at might not be as clear as a lens made of glass.
1671730
This lens is a "DO" (Diffractive Optics). Although not officially an "L" series the build quality it very similar to it with the main difference being the style of optics internal to the lens. It is far higher quality than the standard EF or EF-S lenses.
610118
No, but is just set the focus to the infinite and be happy with this awesome lens. :)
1588767
Hi, thanks question. This lens is contact for FD manual camera. Thanks in advance.
896152
No it doesnt have the blurry side angles. It gives a fish eye picture, I really like the lens.
1732110
I assume it is. It has a very convincing Nikon logo on it and it fits the lens perfectly.
1919973
No. Celestron doesn't allow cool thing like that. In fact Celestron said I can't use third party lenses because they designed it so it won't fit.
1735305
No it is not. Here's some images on these pages that will show what they look like on a FF camera. I got these on Google|Images searching for "rokinon 8mm fisheye full frame": http://photography-on-the.net/forum/showthread.php?p=13659655 http://www.staff.uni-mainz.de/dellani/fotos/20090828-_DSC0851.jpghttp://www.dpreview.com/forums/thread/3611895
823896
As far as I can tell, yes, the lens is glass, and not plastic. I have been pleased with this magnifier which I purchased to read hallmarks on sterling silver. It works well both due to the lighted magnification, but also because it is small and thus fits into tight spaces.
373701
The lens is glass, be careful to install it. Even though there is metal frame to protect the lens, don't drop it.
1472283
Yes. Keep in mind this lens in plastic. It does not have the metal connection ring.
252482
It is 90% tinted. If the lighting is just right and you stare at it close up, you can see what looks like a lens that is pointing toward a specific area. It is sufficiently dark in my opinion.
1723666
I think one can easily cut it with good household scissors though I haven't tried it. The Fresnel pattern is circular and centered in the sheet of material.
962877
Don't think so. Amazon said it was but was missing the metal thing in housing. Very upsetting since I think it damaged a lens. If you look close at the picture it shows a piece of metal hanging down from top. Sure enough it was MIA. Hope this helps!
469590
The lens I have are glass, and metal rings. They can turn for different effects.