View source for Sigma 8mm Fisheye Canon 350D MrotatorCP

==Setup==
* Sigma 8mm f/4
* Canon 350D
* Agnos MrotatorCP

==Shooting==
* With the above combination I can shoot a panorama in either six or three shots with yaws of 60 or 120 degrees respectively.
* For the three shots process, position the camera 4mm backward in relation to its calibrated position for the six shots process.
* If your aim is the three shots process (a time winner for cheap real-estate service), you will be better served with a Nikon D70 for which the MrotatorC was originally designed. It has a larger sensor, which gives you more overlap. The overlap of the images with the Canon 350D is extremely small.

==Process==
The process that works for me (with PTgui):
* import source images
* set approximate lens settings
* set panorama settings
* the crop is automatically good
* set image parameters
** distribute images by yaw (thank you Joost for the Fill yaw function!)
** roll all images -60 (the Agnos MrotatorC holds the camera at 60 degrees to use as much possible of the sensor surface)
** set approximate pitch (thank you Luca for the great idea of orienting the camera slightly up, giving better coverage of the zenith)
* set control points (i add at least two vertical lines)
* first advanced optimizer run: optimize for pitch only on all images, including anchor image, linked (the camera is slightly tilted upwards on the MrotatorC and the angle can not be precisely measured)
* second optimizer run: if necessary, optimize a second time for all parameters
* blend and stitch, serve hot with either a Java applet or QuickTime

===Lens Parameters===
Can be stored in PTgui's lens database
* lens type: circular
* HFOV 182.772
* a: -0.07611
* b: 0.003985
* c: -0.041765
* d: 0
* e: 0
* g: 0
* t: 0

==Notes==
* the above process works with my guinea pig, a little 5x5 (1.50mx1.50m) shower/wc room, as well as with some larger rooms.
* Hypothesis: since the entry point of the lens changes with the angle, for a perfect, uncorrected stitch exact slices should be used, like an orange. To be verified.

==References==
* [http://michel.thoby.free.fr/SIGMA8mm/Alpha%20test%20300D/Nodal%20point%20of%20SIGMA%208mm.html Michel Thoby has studied the Sigma 8mm in detail]
* [http://www.agnos.com/catalogo.htm?v_lingua=ITA&v_iss_web=0000000000000007345831040253&v_categ_lista=PR001-00007&v_cod_art_sche=MROTATORC Agnos MrotatorC]

[[Category:Tutorial:Basic need]]

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