I got a 7mm Spiratone fisheye recently and I'm still trying to figure out how to shoot with it...to frame a shot that when cropped doesn't "look fishy"..wide yes, fisheye no...
That's a nice piece of work with the lens correction...My old PS version doesn't have it...oh well......I should bring down the mid-range a bit too...and did...and replaced the original, thanks...
AuntiPode wrote:
In prior versions of Photoshop, Lens Correction is under Filter>Distort. They moved it up a level because it fit more logically than under Distort.
Found it...it's called PINCH....unfortunately in THIS shot, it pinches the bottom half but not the ceiling beam on the right, exaggerating its bowing, unless I crop it out and I would prefer not to do that...and worse...
...with the very fuzzy images that this lens produces, softening it further with pinching is something I'm not keen on...still....
I will keep it in mind on other shots...thank you....I learned something today...and that's a good day ANY day...
jay tieger wrote:
I got a 7mm Spiratone fisheye recently and I'm still trying to figure out how to shoot with it...to frame a shot that when cropped doesn't "look fishy"..wide yes, fisheye no...
The difference between a fish eye and a lens that doesn't look "fishy" is the use of anastigmatic correction elements to flatten the focal plane.
A simple lens focuses on a spherical surface — why our eyes are round not cubes. To get an image in focus on a flat film or sensor plane the lens maker adds corrective elements. By way of analogy what happens to the image is like cutting a tennis ball in half, nailing the center to the board, then stretching out the equator of the ball flat and nailing it to to the board. That accounts for the stretching of the image in the long dimension on anastigmatic UWA lenses like my Canon 10mm-22mm. All lenses have anastigmatic correction to some degree, but the stretching it causes is more evident on UWA lenses.
This screen shot shows how CS5 corrects the distortion. http://super.nova.org/EDITS/DeFish.jpg
The net effect is a less distortion but a smaller cropped image. All things considered if you don't want the circular fisheye effect the more effective strategy is don't use a fisheye lens
