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Lightroom, Canon DDP, Nikon View NX2 have lens profiles. Some cameras will do lens corrections in their internal firmware. Lightroom and others detect the lens used in the exif data when uploading or you can select what lens you used when developing your image. They have a list. The lens corrections needed to counteract distortion are already worked out.
That makes it easier. Otherwise there is a manual slider for it and you can also do it in Photoshop under Filter/Distort/Lens Corrections.
You can correct for vignetting (easiest thing to correct for) and distortion.
For a fisheye there are software programs that will de-fisheye the image distortion. I think DXO have one. DXO make a stand alone program for this lens correction work.
As far as the aperture iris causing different diffractions that is also an item that is noted in many lens reviews. Sometimes they are referred to as sunstars which is the diffraction spikes produced by a lens taking an image of the sun.
Some have 9 blade apertures, some 8 etc. Some are rounded others are hexaonal. Rounded ones would be best. Fuji's are rounded for example.
Greg.
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