Great explanation, David! Thanks. I will archive that one too. :-) One question, though. Have you any idea how much the nodal point change with zoom setting?
best, Jostein 2008/9/11 David Savage <[EMAIL PROTECTED]>: > I've only done 1 full 360 spherical pano: > > <http://www.arach.net.au/~savage/Misc/360%20Test.mov> > > I've Never really had the need or desire to do more of them. > > Firstly I would have recommended the Panosaurus: > > <http://gregwired.com/pano/Pano.htm?gclid=CL724t6u0pUCFSJIagodTViShw> > > ...or the Nodal Ninja: > > <http://www.nodalninja.com/> > > Both are cheaper than the Manfrotto product, & the NN is more compact. > But done is done. > > Secondly, I'm assuming that these are for a real estate website so > ultimate resolution isn't a huge factor. Given that you are > potentially going to be doing these regularly, consider picking up the > 10-17 FE. It'll save time in the long run. > > Thirdly, finding the nodal point isn't hard, but it can be fiddly. The > method I've used in the past, was recommended to me by Rob Studdert & > works well. All you need is a length of string weighted at one end. I > tied it to a light fixture & set up the camera about 1m (3') away from > the string lining the camera up so that the string is in line with > another straight vertical feature (a door frame). > > Ensure that the tripod is correctly levelled. I don't use the level > built into the tripod, I use a separate bulls eye level I bought from > a hardware store. Once the tripod is level, level the camera. I use a > hot shoe mounted 2 axis spirit level. Using the heads adjustments get > the 2 axis level, rotate the camera 90 degrees & check & adjust as > needed. (if you end up doing lots of these investing in a levelling > head may be a good bet) > > Now that the rig is levelled check that the string & door frame are > still aligned. If so, focus on infinity and rotate the camera so that > the string is at the extreme edge of the frame. If parallax error is > evident, it'll show as separation between the edge of the droor frame > & string. Adjust the forward & aft slide to compensate. now rotate the > head so that the string is at the other extreme edge. > > Now once you are in the ball park, I recommend (as was recommended to > me) taking 3 photos at each setting. Centred, extreme left, extreme > right. not down shot numbers & slide settings. In Photoshop import all > 3 shots into the same file, overlay them so that the string is aligned > & check the results. When you find the set of images with no offset > between the string & door frame, you've found your nodal point > setting. > > The reason for this step is that you can't guarantee that your eye, > when looking through the viewfinder, is always in the same spot, so > you may introduce a second set of parallax errors if you just do it by > eye. > > Now I need to hurry up so I'm not late for work :-) > > Cheers, > > Dave > > > > 2008/9/11 Paul Stenquist <[EMAIL PROTECTED]>: >> I applied for a gig shooting virtual reality tours of houses. The job >> should generate about ten assignments a month. To get a shot at it, I >> had to say I had a panorama head. Shortly after sending an e-mail >> application I received a call asking me to shoot a test by Friday. So >> I had to order a panorama head immediately with overnight delivery. I >> have to shoot vertical with a 17mm focal length, and, based on what >> I've read, It seems I need a head that will allow me to adjust for >> the nodal point with wide angle lenses. I took a quick look around >> and bought a Bogen / Manfrotto 303PLUS QTVR Geared Panoramic Head. >> It's here: >> http://www.bhphotovideo.com/c/product/293641-REG/ >> Bogen_Manfrotto_303PLUS_303PLUS_QTVR_Geared_Panoramic.html. >> Has anyone used this head? How hard is it to locate the nodal >> point? Learning on the fly here. >> Paul >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
