Here I have a photo of the Boston skyline, taken with a 18-200mm lens at 18mm:
The first thing I’ll do is select the elliptical marquee tool from the tool bar:
As I’m making my selection on the photograph, I’ll hold down the Shift key on my keyboard to keep the circle proportionally round. I’ll try to make the selection as big as I can without extending outside the photo. Then I’ll center it over the portion of the photo that I think is most interesting. While I’m centering the circle, I’ll make sure that I still have the elliptical marquee tool selected:
The next thing I’ll do is reverse the selection, so that I’m selecting everything in the photo except the circle so that I can get rid of the background. I’ll go to Select/Inverse
Now I’ll hit the Delete key on my keyboard. The background will turn white:
Now I can use the tool to center the circle:
Now I do the again, because I want to make the background black:
I’ll use the paint bucket tool from the tool bar to fill the background black:
Now for the last time I’ll do a Select/Inverse
The next step is to give the circle the fisheye look. Here I’ll go to Filter/Distort/Spherize
Here the Spherize dialog box comes up. I’ll make the amount 100% and I’ll set the Mode to “Normal”:
< I’ll hit CTRL-D on my keyboard to deselect. Then I’ll just crop out some extra black background.:
Here is the finished photo:
I hope you enjoyed this tutorial, and have fun playing with Photoshop.
P/S ; I copied from How TO Create A Fisheye Lens Effect Using Photoshop.