Difference between revisions of "Sigma 8mm Fisheye Canon 350D MrotatorCP"

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* [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://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]
 
* [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]
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[[Category:Tutorial:Basic need]]
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Latest revision as of 21:53, 21 September 2008

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

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