I borrowed a Sigma 15mm Fisheye lens for some bullfrog images and now I have a new favorite lens for such photography. This lens focuses down to 5.9 inches which worked quite nicely on these large frogs. I used the DX crop on the D800 so that I could fill the foreground a little better with the frog and eliminate the sky from the background. The effective focal length of this fisheye lens with the DX crop would be 22.5mm.
Nikon D800
Sigma 15mm f2.8 EX DG Fisheye lens
ISO 400
f16 @ 1/80
Handheld
Live View
Bubble Level
Look forward to comments.
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) are stunning- also, I love the transition from the sharp head to the feet under water, what lovely effect! 
