Archived posting to the Leica Users Group, 2005/05/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The strange thing with the shot is that if you level the horizon (1.72? CCW) it still doesn't look horizontal. If you put the verticals at 90? (as is the original), it isn't either. If you level the pavement in front of the bridge (0.85? CCW), it starts to look horizontal. But the verticals aren't 100% vertical any more. So it might have something to do with cam tilt. Then again, if it were cam tilt, the verticals wouldn't be parallel. Which they are. So it might have something to do with your VF frame that isn't 100% parallel with your cam body. Which would be strange because it would have shown up in other shots, too. So it migh have something to do with the fact that (if so) it is a RF: the main entrance of St. Paul's is slightly of centre, as often happens when you try to frame objects behind each other in one axis in the centre of the VF: the final result is seldomly dead on and plays strange optical tricks with the eye. But that wouldn't explain everything. I'm pretty sure that you saw it dead centre through your VF and that it looked symmetrical when you shot it. So my guess is that the bridge is a bit to the left of the axis of St. Paul's. Thus, you being in the centre of the bridge and following the bridge's axis, the horizon tilted a bit CW, keeping the verticals parallel. This rises an interesting question: did Foster make (apart from the oscillation issue) an architectural mistake? The bridge sure doesn't seem out of the axis of St-Paul's at first sight, but it might be. I can't remember what the situation was when I visited Tate Modern, but I would have seen it, though. I suppose he chose to be perpendicular to the Thames, and St. Paul's is just not parallel to the river. In other words, Sir Christopher Wren made the "mistake"? I seems to be the latter: http://www.ph.ucla.edu/epi/snow/1859map/map1859_j-l_19-21.html Or http://tinyurl.com/a2fcy In any case: I don't think it is possible to get it perfect when shooting or by just tilting the horizon: some more Photoshop fiddling might be needed, if you feel like it :-) Hey, this is fun! > From: Peter Dzwig <pdzwig@summaventures.com> > Organization: Summa Ventures Ltd > Reply-To: Leica Users Group <lug@leica-users.org> > Date: Wed, 18 May 2005 09:18:11 +0100 > To: Leica Users Group <lug@leica-users.org> > Subject: Re: [Leica] PAW 20 Millenium Bridge and St. Paul's - Try this!! > > Douglas Sharp wrote: > > This could infer a tiny bit >> of lens distortion, that the camera was not quite in the horizontal >> plane, possibly tilted up a bit, or that the scanned negative was not >> quite flat. > > Think I was sober..no seriously since I have a slight astigmatism it's not > inconceivable that I didn't notoce that I was slightly off level. > > Thanks for your help. > > Keep looking, > > Peter >> cheers >> Douglas >> >> Peter Dzwig wrote: >> >>> Douglas Sharp wrote: >>> >>>> An excellent shot Peter, >>>> love the symmetry! >>>> but couldn't it take a slight correction of the horizontal? >>>> I think its about 1 or 1.5 degrees out of kilter. Otherwise perfect >>>> for me. >>>> cheers >>>> Douglas >>>> >>> >>> Douglas and List, >>> >>> see which one you you think is straight... >>> >>> http://gallery.leica-users.org/album164/MilleniumBridge200505 >>> >>> the original >>> >>> or: >>> >>> http://gallery.leica-users.org/album164/MilleniumBridge200505Rot1 >>> >>> I think that it is it straightened...it took 0.4 degrees of rotation. >>> If that does truly fix it (I am not entirely sure) Douglas you have >>> very sharp eyes!! >>> >>> All the best, >>> >>> Peter >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >