[MrA]

Sorry about the slightly wierd thread title!

I've read a few sites this morning talking about using "defish" software, with for example the Pentax 10-17mm fisheye lens. The motivation is obviously to save money/weight by only having one lens, but getting the effect of both spherical and a rectilinear lenses.

The obvious point is they all focus on buying the fisheye lens, rather than the rectalinear one

My question therefore, is that if one were minded to work mostly rectilinearly (say with a Sigma 10-20 or Pentax 12-24) - is there software which can "fish" the image - i.e. make a curved image from one with regular perspective? For the rarer occasion where the effect is called for?

Presumably, if it exists, one could then add distortion to any image. Not quite sure why you would distort an image taken at 200mm, but just thinking around the issue...

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Last edited by MrA; 06-14-2008 at 06:46 AM. Reason: typo

[NaClH2O]

Sorry about the slightly wierd thread title!

I've read a few sites this morning talking about using "defish" software, with for example the Pentax 10-17mm fisheye lens. The motivation is obviously to save money/weight by only having one lens, but getting the effect of both spherical and a rectilinear lenses.

The obvious point is they all focus on buying the fisheye lens, rather than the rectalinear one

My question therefore, is that if one were minded to work mostly rectilinearly (say with a Sigma 10-20 or Pentax 10-24) - is there software which can "fish" the image - i.e. make a curved image from one with regular perspective? For the rarer occasion where the effect is called for?

Presumably, if it exists, one could then add distortion to any image. Not quite sure why you would distort an image taken at 200mm, but just thinking around the issue...

As many of you know I own and frequently use the Zenitar 16mm fisheye, but since it was actually designed for a full frame camera, the "fisheye effect" is somewhat diminished on the lens, I have always wondered if there was a way to add MORE fisheyness (so to speak) to some of my shots.

NaCl(eventho my boss says I'm too fishy as it is)H2O

[rburgoss]

I guess I understand "de-fishing" as in "making the barrel distortion go away". If this is the case, most image processing programs as photoshop or corel's photopaint, offer plugins under the name of "sphere" or "pinch´-punch". Most standalone "de-fishing" programs do the same, but as you can see in the following example, they do a fine job towards de center of the frame, but leave edges untoched. Of course, you can always crop the "unfixed" section, but then, what it would be the point in using such wide angle coverage, if you later crop it.

Hope this helps.

Attachment 13968

Shot "old school", with negative film"

RB

[axl]

I think "re-fishing" or creating barrel distortion shourd be easy to achieve in Pentax photo laboratory or any RAW converter for that matter. They all should have lens distortion correction slider. If not tha just try some effects in Photoshop...