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I work in archaeoastronomy and was looking EVERYWHERE for a perfectly circular lens for my Micro 4/3 camera. I looked for 4 days and all I found were lenses that cropped the images (so, a no go for me) and one lens that was over $3,500...
This lens captures extremely blurry photos and the depth of field is horrible. It is just impossible to have whole frame in focus (Or may be its an issue with the piece I received). I have just raised a return request to seller.
Fantastic lens. For an idea of what this lens can do, go on any of the picture social websites.
Like the lens, but it took a LONG time to get it.
This Sigma 4.5mm was bought for night star shots, horizon to horizon, and it does that indeed. In other uses, if one can keep one's feet out of the frame, it is wonderful for cityscapes. A walk in the park can be almost magical with this real fisheye.
So I work a lot and photography is my tool for reminding I'm a much more interesting person outside of my work. I was a paid photographer at one point, maybe I might do it professionally in future. So I was interested in this lens since I could finally get this effect on my smaller sensor camera.
I picked this one out for my Sony Alpha 77 from all the other options, because this one has autofocus. I take a lot of self portraits and I needed autofocus for that purpose. It is exactly what I expected, works well in low light, sufficiently sharp, and fun to use.
I've wanted a "comedy" lens for a while and also wanted to continue with VR pano shots without having to shoot 100 plus pics for hours of stitching so I plumped for this little lens. On unpacking, i have to say that for my first Sigma, I was pleasantly surprised.
Quick Focus, Rugged
This is the most extreme fish eye lens you can get for a APS-C camera. With a full 180 view, you get a full circular image, like the Sigma 8mm FE on a full frame cmera. Good lens quality. Luminous, fast and an excellent minimal distance of focus.
Perhaps I got a bad lens, but this lens is far too soft for my purposes. Remember, 180 degrees of vision is squeezed into a circle within the rectangular canvas of your camera's sensor (hence circular fisheye).