No, the problem is,that the correction is incomplete! The image is well corrected for vertical distortion, e.g. vertical lines are now vertical, but it needs a second correction along the horizontal axis: The perspective lines from left to right converge too steeply for us too 'feel right'. The ornaments on the gateway especially thus appear distorted. You thus need a second correction along this line.
On a shift lens you do this by rotating the lens so that the shift effect influences two dimensions (horizontal and vertical). An example where this is well done can be seen at: http://www.zoerk.de/pages/g_opera.htm (20mm Shift and 30 degree rotation) Doesn't look like a wide angle picture after correction? Well done! A shift lens lets you influence the convergence of straight lines in all directions. For a natural perspective vertical lines have to be made vertical, but too strongly converging horizontal lines also need modification to not appear exaggerated (28mm is just not the way our brain sees things). Knut At 04:31 14.06.02 -0700, you wrote: >Exactly!!! > >But, at least from the technical pov, they are not. >If you check the verticals, they are, well, vertical :) >What's more interesting, I found that even if I do the correction 95%, >rather than 100%, as it was suggested here, it still looks overdone. >And that was my original point. It doesn't work the way (I) want it to. >I think it has to do with the way human eyes work: from a given >viewpoint one expects a definite amount of distortion, and when it'snot >there, it starts looking... well, weird. > >For minor corrections, it does work wonders though. > >Mishka > > > From: John Coyle > > Subject: RE: 28mm/3.5 shift lens: worth getting? > > Date: Thu, 13 Jun 2002 22:59:24 -0700 > > -------- > > > > Interesting - looking at both Fred and Mishka's corrected images on > > my screen, they seem over-corrected! Does anyone else get this >effect? > > > > > > John Coyle > > Brisbane, Australia >Yahoo! - Official partner of 2002 FIFA World Cup >http://fifaworldcup.yahoo.com >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
