RE: [PanoToolsNG] Help with Tokina 10-17mm
- Optimizing can be tricky at higher focal lengths. Especially wrapping around
and hitting the zenith and nadirs.
Once, you have all your zenith and nadirs added, with good cps to all their
touch images, and especially from 0 last image.
You should get a good optimization. Normally, however, as long as you have
the last image well cps to the first image, your fov should read correctly.
My attempts at 10mm rectilinear, lead to using more overlap, not less. This
gives you second chances sometimes on mistakes which will occur more
frequently at 10mm.
Looking again, the tokina is a fisheye, 6 around is the correct number, the
correct procedure is a pitch up or pitch down, with 3 more at z or n.
If it's a sky shot, I'd pitch up, and do your three down. Normally, I do the
reverse, using the viewfinder easily to see where the lens catches the head.
Southern Digital Solutions LLC - Atlanta, Georgia
From: PanoToolsNG@yahoogroups.com [mailto:PanoToolsNG@yahoogroups.com] On
Behalf Of Mark D. Fink
Sent: Monday, November 19, 2007 8:11 AM
Subject: [PanoToolsNG] Help with Tokina 10-17mm
I'm getting stumped by a project I'm working on. A client of mine has a
Canon 350 and they are shooting with the Tokina 10-17 at the 10mm setting.
When I load the images into PTGui, the EXIF information reads that it was
shot at 10mm, but PTGui consistently optimizes it as 12.1mm.
I had done a sample "dummy" PTGui project using fake images that I created
in PhotoShop that were just filled with solid colors. When I told PTGui that
these were "shot" at 10mm, using the Canon 350 sensor size, I was able to
get very nice coverage using seven shots: six around at -10 pitch, and one
In real life, this doesn't work. We have to use two zenith shots offset by
90 degrees of yaw to cover the zenith. Even then, there isn't much overlap,
so finding control points has proven difficult at times.
If we were to shoot the six around at 0 degrees pitch, with two zenith, then
there is plenty of overlap, but I'm trying to find the solution with the
fewest number of shots and decent overlap.
Why I'm getting this discrepancy between what EXIF says and what PTGui
optimizes is leaving me completely stumped. Help!
[Non-text portions of this message have been removed]